* Add ability to generate particular types as Java interfaces #606 (#610)

* Gradle 6.8.3.

* Added typesAsInterfaces config option.

* Updated doc.

* Basic implementation for generating type as interface.

* Tests for generating type as interface.

* Code style fixes.

* Code style fixes.

* Java 1.8 build fixes.

* Code style fixes.

* Code style fixes.

* Attempt to fix compilation.

* Code review fixes.

* Revert "Add ability to generate particular types as Java interfaces #606 (#610)" (#613)

This reverts commit 994f6fee.

* Bump lombok from 1.18.18 to 1.18.20 in /plugins/gradle/example-client

Bumps [lombok](https://github.com/rzwitserloot/lombok) from 1.18.18 to 1.18.20.
- [Release notes](https://github.com/rzwitserloot/lombok/releases)
- [Changelog](https://github.com/rzwitserloot/lombok/blob/master/doc/changelog.markdown)
- [Commits](https://github.com/rzwitserloot/lombok/compare/v1.18.18...v1.18.20)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: NAlexey Zhokhov <alexey@zhokhov.com>
Co-authored-by: NBogdan Kobylynskyi <92bogdan@gmail.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

(cherry picked from commit 1e3360b8)

Bumps [spring-boot-starter-data-mongodb](https://github.com/spring-projects/spring-boot) from 2.4.2 to 2.4.3.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.4.2...v2.4.3)
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Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 2.4.2 to 2.4.3.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.4.2...v2.4.3)
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Bumps [junit-jupiter-api](https://github.com/junit-team/junit5) from 5.7.0 to 5.7.1.
- [Release notes](https://github.com/junit-team/junit5/releases)
- [Commits](https://github.com/junit-team/junit5/compare/r5.7.0...r5.7.1)
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Bumps [junit-jupiter-engine](https://github.com/junit-team/junit5) from 5.7.0 to 5.7.1.
- [Release notes](https://github.com/junit-team/junit5/releases)
- [Commits](https://github.com/junit-team/junit5/compare/r5.7.0...r5.7.1)
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Bumps [mapstruct](https://github.com/mapstruct/mapstruct) from 1.4.1.Final to 1.4.2.Final.
- [Release notes](https://github.com/mapstruct/mapstruct/releases)
- [Commits](https://github.com/mapstruct/mapstruct/compare/1.4.1.Final...1.4.2.Final)
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Bumps [mapstruct-processor](https://github.com/mapstruct/mapstruct) from 1.4.1.Final to 1.4.2.Final.
- [Release notes](https://github.com/mapstruct/mapstruct/releases)
- [Commits](https://github.com/mapstruct/mapstruct/compare/1.4.1.Final...1.4.2.Final)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [lombok](https://github.com/rzwitserloot/lombok) from 1.18.12 to 1.18.18.
- [Release notes](https://github.com/rzwitserloot/lombok/releases)
- [Changelog](https://github.com/rzwitserloot/lombok/blob/master/doc/changelog.markdown)
- [Commits](https://github.com/rzwitserloot/lombok/compare/v1.18.12...v1.18.18)
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Bumps [spring-boot-starter-data-mongodb](https://github.com/spring-projects/spring-boot) from 2.4.1 to 2.4.2.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.4.1...v2.4.2)
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Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 2.4.1 to 2.4.2.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.4.1...v2.4.2)
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Bumps [spring-boot-starter-data-mongodb](https://github.com/spring-projects/spring-boot) from 2.4.0 to 2.4.1.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.4.0...v2.4.1)
Signed-off-by: Ndependabot[bot] <support@github.com>
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Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 2.4.0 to 2.4.1.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.4.0...v2.4.1)
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* support kotlin

* fix unit test

* fix scala

* add plugin, fix doc

* Do not use empty data class

* update

* update

* add unit test.
remove tostring

* update

* update

* update

* update

* refactor

* add unit test

* support option  any where.
https://github.com/kobylynskyi/graphql-java-codegen/issues/415

* add task  with kotlin in gradle

* 🚀 supportScalaOption for primitive type

* fix

* add unit test for scala Option

* change var name

* Complete Scala test

* For kotlin, 'getUseOptionalForNullableReturnTypes' is ignored, which is compatible with the nullable semantics of any graphql.

* add unit test

Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 2.3.5.RELEASE to 2.4.0.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.3.5.RELEASE...v2.4.0)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 2.3.4.RELEASE to 2.3.5.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.3.4.RELEASE...v2.3.5.RELEASE)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>