update release notes for release 2.10.0 (#148)

Author: Claudenw

docs/src/site/markdown/RELEASE_NOTES.md

@@ -3,6 +3,34 @@
 
 All releases can be found at https://github.com/Aiven-Open/bigquery-connector-for-apache-kafka/releases
 
+## v2.10.0
+### What's changed
+- Add ability to ignore unknown fields in kafka messages (#88)
+- skip test on kcbq-api build (#142)
+- Enable partition decorator syntax for Storage Write API (#69)
+- Specify Trace ID to enable BigQuery to track traffic originating from this connector. (#141)
+- Add ByteBuffer TypeAdapter to avoid reflection crash on Java 9+ (#140)
+- Add feature to update table schemas for GCStoBQ load jobs (#134)
+- Enable connection pooling on Storage Write API Default Stream (#89)
+- Update contributors list (#138)
+- Add design doc for WriteAPI partition decorator support (#135)
+- Add design doc and best practice doc (#136)
+- Add since tags to some configuration options
+- Update project id of BQ target table when useCredentialsProjectId is enabled (#123)
+- Bump version to 2.10.0-SNAPSHOT
+
+### Co-authored by
+- Aindriú Lavelle
+- Claude Warren
+- hasan-cosan
+- Mariia Podgaietska
+- minsungoh
+- Siddharth Agrawal
+- Veli Can Ünal
+
+### Full Changelog
+https://github.com/Aiven-Open/bigquery-connector-for-apache-kafka/compare/v2.9.0...v2.10.0
+
 ## v2.9.0
 ### What's changed
 - Fix retry login in GcsToBqWriter (#112)