Release v0.9.0

Release v0.9.0

This release represents roughly one year plus of refactors aimed at improving performance and removing
protobuf as a core link time dependency of CEL. There are still many more changes in flight, but this release
represents a significant update in how CEL is designed and implemented within C++.

New Contributors

• @tyxia made their first contribution in #164

Full Changelog: v0.8.0...v0.9.0