Release AnnotationPlugin v9:0.9.0

[pengdev]

Changelog mapbox-android-plugin-annotation-v9:0.9.0:

Bugs

• Consumable events for click listeners #1124
• Support multiple manager to be draggable #1125
• End of drag event is consumed #1141

Release checklist

• Cut the release branch
• Run through testapp/demo app and test all activities
• Update CHANGELOG.md
• Change version name to 0.9.0 in gradle.properties
• Change release branch in the circle.yml release job to the current branch
• Publish 0.9.0 artifact to Maven Central
• Change version name back to 0.10.0-SNAPSHOT
• Change release branch in the circle.yml back to master
• Merge the release branch to master
• Tag version mapbox-android-plugin-annotation-v9:0.9.0 in GitHub

Post-release

• Update README.md
• Update constants.js file in android-docs repo
• Generate updated javadocs and add to android-docs repo
• Bump dependencies in Bumped annotation plugin to 0.9.0 mapbox-android-demo#1362

/cc: @mapbox/android
Additional notes
Plugin artifacts are versioned based on the major Maps SDK version. Each plugin's artifact name includes a suffix that declares which major version of the Maps SDK this plugin's version is compatible with, for example:

{artifact_name}-v{major_maps_sdk_version}:{plugin_version} -> mapbox-android-plugin-annotation-v7:0.4.0