References

This is a pre-requisite of #76 step 3, and enables third-party extensions to register the client capabilities they provide with the server (which is essential for some servers to return relevant responses).

Code changes

• adds optional capabilities?: ClientCapabilities to IFeature public interface
• surfaces the capabilities from connection through connection_manager up to adapter
• in adapter the capabilities of active features are merged

User-facing changes

• For servers which optimize responses/work based on client capabilities the performance might be slightly increased when specific features are disabled

Backwards-incompatible changes

None

Chores

• linted
• tested
• documented
• changelog entry