Add missing sources jar into published android artifacts (#32982)

Summary:
when migrated to `maven-publish` in https://github.com/facebook/react-native/issues/31611, the sources jar is not included by default from `maven-publish`. so react-native 0.66 / 0.67 doesn't include sources jar in npm published artifacts. it's not ideal for debug or tracing code.

this pr added the sources jar into the published artifact.

## Changelog

[Android] [Fixed] - Add missing sources jar into published android artifacts

Pull Request resolved: https://github.com/facebook/react-native/pull/32982

Test Plan:
make sure sources jar is included in artifact.

```
$ ./gradlew :ReactAndroid:installArchives
$ find android -name '*sources.jar*'
```

Reviewed By: ShikaSD

Differential Revision: D33842979

Pulled By: cortinico

fbshipit-source-id: f99ad46ce0cca0cfc2ab1d5c5a4fcb40a02683e7

ReactAndroid/build.gradle

@@ -272,6 +272,12 @@ task installArchives {
     dependsOn("publishReleasePublicationToNpmRepository")
 }
 
+// Creating sources with comments
+task androidSourcesJar(type: Jar) {
+  classifier = 'sources'
+  from android.sourceSets.main.java.srcDirs
+}
+
 android {
     compileSdkVersion 31
 
@@ -414,6 +420,9 @@ afterEvaluate {
                 // Applies the component for the release build variant.
                 from components.release
 
+                // Add additional sourcesJar to artifacts
+                artifact(androidSourcesJar)
+
                 // You can then customize attributes of the publication as shown below.
                 artifactId = POM_ARTIFACT_ID
                 groupId = GROUP