close

Closes the session and releases all associated resources.

Performs the following steps in order:

• Cancels the internal coroutine scope, stopping message processing.

• Closes callsInbox, causing any active for loop over it to terminate.

• Completes all pending request calls exceptionally with JsonRpcException.InternalError.

• Calls JsonRpcTransportSession.close on the underlying transport. Any error thrown by the transport is swallowed and logged as a warning.

This function is idempotent: calling it more than once has no effect and does not throw.