Release/2.1.0

[ttypic]

Full Changelog

What's Changed

• Added support for VCDIFF delta-compressed messages. When deltas are provided by the service,
  the SDK reconstructs full message payloads from the base content and the received delta,
  reducing bandwidth usage without changing your application code.

Summary by CodeRabbit

• New Features
  • Support for VCDIFF delta-compressed messages: SDK can reconstruct full payloads from base+delta to reduce bandwidth without app changes.
• Documentation
  • Added v2.1.0 entry to the changelog with release links and a Full Changelog reference.
• Chores
  • Bumped package and public library version to 2.1.0, updated optional vcdiff-decoder dependency, and adjusted the release/publishing workflow steps.