v0.8.0

Please see the migrating from v0.7 docs for instructions.

Changes:

• Moves to Akka Persistence JDBC v5.0.0
• Moves to Opentelemetry to support more observability vendors
• Improves DB read performance with custom Hikari connection pool
• Implements a COS schema migrator as an Akka cluster singleton
• Implements a custom message serializer for persistence and Actor communication via scalapb
• Simplifies builds with the Java Application Native Packager