This reverts commit 15765b7b

* 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/maven/example-server

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)

* Introduce code style and reformat existing code #403

* Add check-code-style.yml workflow #403

* Add graphql-codegen-check-style.xml and enable it in the workflow #403

* Fix check-code-style.yml workflow

* Fix build issues

* Revert back changes in gradlew script

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)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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)
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)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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)
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 2.4.1 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)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>