Merge changes from topics "rpc-session", "virtmgr-binary"

* changes:
  rpc_binder: Prevent RpcServer shutdown deadlock
  rpc_binder: Mark ARpcServer_shutdown [[nodiscard]]
  rpc_binder: Create C/Rust bindings for bootstrap UDS
  rpc_binder: Refactor C/Rust wrappers for RpcSession
  rpc_binder: Remove unused VsockFactory server code