Motivation:

Review code styles with some bots automatically.

Modifications:

Set up ReviewDog in GitHub Action to review code style.

Add more check rules to checkstyle plugin.

Result:

Obvious code styles can be reviewed and commented automatically.

[BUG]Fix the bug of port identification failure when connecting Oracle with Sid mode (JDBC: Oracle: thin: @ < host >: < port > / < Sid >) (#4320)

* [BUG]Fix the bug of port identification failure when connecting Oracle with Sid mode (JDBC: Oracle: thin: @ < host >: < port > / < Sid >)
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

### Motivation:

Reduce footprint when tagging spans with the deprecated API: `AbstractSpan#tag(String, String)`.

### Modifications:

- Adopt [prototype pattern](https://en.wikipedia.org/wiki/Prototype_pattern) to create `Tag`, prevent from creating too many `StringTag` instances and `GC`ed.
- Replace `AbstractSpan#tag(String, String)` with `AbstractSpan#tag(AbstractTag, String)`.

### Result:

- Footprint is reduced.

* Enhance gRPC plugin
Co-authored-by: NKanro <higan@live.cn>
Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>
Co-authored-by: NGuoDuanLZ <739537111@qq.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Provide Avro plugin
* provide testcase for avro-plugin
Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>

* Drop support of protocol v1 (sw3)

* Remove versioning logic further

* Remove more version5-only classes

* Commit missing files

* Update submodule and address review comment

* Fix failed tests

* feat: add support plugin of mongodb v3.6.x

* update support-version.list

* update Supported-list.md

* update Supported-list.md

* Add witness class for v3.6

* update plugins-test.yaml
Co-authored-by: Nzhang-wei <pknfe@outlook.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>
Co-authored-by: NWeiyi Liu <liuweiyi@cmss.chinamobile.com>

* Split the `collect_http_params` as per plugins for better performance

* Add missing change

Plugins of Tomcat, Spring MVC, Armeria are supported for now

* shardingsphere 4.x RC3 test

* shardingsphere 4.x RC3 test

* shardingsphere 4.x RC3 test

* shardingsphere 4.x RC3 plugin

* shardingsphere 4.x RC3 plugin

* shardingsphere 4.x RC3 plugin

* shardingsphere 4.x RC3 plugin temp for a test

* shardingsphere 4.x RC3 plugin revert temp changes

* shardingsphere 4.x RC3 plugin change package name
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Add play-scenario

* Set play plugin as default
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>
Co-authored-by: NWeiyi Liu <liuweiyi@cmss.chinamobile.com>

* Move Armeria plugin to default plugin list

* Move Armeria plugin to default plugin list
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Move Webflux plugin into default list.

* Fix a typo.

* Move lettuce into default plugin

* Fix maven pom

* Add Java Agent for Apache HttpClient 3.x

* Update Supported-list.md

* Update pom.xml

* [maven-release-plugin] prepare release v6.6.0

* [maven-release-plugin] prepare for next development iteration

* webflux-reactive

* add support version comment, modify gateway

* add test case, modify name

* add docs

* remove healthCheck

* Remove the local span and exit span register mechanism in Java agent scenario.

* Fix config, plugin, and document, as exit span is not required register anymore.

* Try to fix the test case expected data due to no register for exit span.

* Fix toolkit case.

* Remove exit span from plugin test framework document.

* Update protocol, FAQ, and CHANGELOG documents to highlight this change.

* Fix NPE when no entry span in the whole segment. Set endpoint to null in segment entity.

* Fix the snapshot and add inexistence operation name id.

* Fix several async cases.

* Fix undertow test case.

* Fix wrong error log name.

* Keep name consistent with 6.x concepts.

* Try to fix 3 async scenarios.

* Fix okhttp case.

* Fix Spring Async case.

* Fix another NPE

* Fix NPE when first span has no endpoint id when it is local or exit span.

* Still fill first operation name when no endpoint id.

* grpc scenario

* update support-version.list

* Intercept feign RequestTemplate resolve args method ,get the url without parameters

* fix ci warnings

* optimize import

* fix: miss  path in feign target url like "http://localhost:8080/feign-scenario"
     fix feign-scenario test use pathVariable

* Add testcase to DefaultHttpClientInterceptorTest

* Clean ThreadLocal

* User one ThreadLocal replace two. User try/final  remove ThreadLocal .

* Code Optimize

* Add elasticsearch 6.x plugin & elasticsearch 6.x test scenario

* [maven-release-plugin] prepare release v6.5.0

* [maven-release-plugin] prepare for next development iteration

* move FILTER_LENGTH_LIMIT

* fix checkstyle

* redisson support high lv version

* bugfix

* add comment

This reverts commit d9fcda13.

* refactor:extract common module postgresql-common

* remove sql param tag.

* delete the deploy plugin

* Add postgresql agent sql query param show