[prep-release-3.1.0-rc1] Update version to 3.1.0-rc1
[prep-release-3.1.0-rc1] Add migration for 3.1.0-rc1
[prep-release-3.1.0-rc1] Prepare Changelog
[prep-release-3.1.0-rc1] Add changelog for 3.1.0-rc1