* Port forwarding support
* .golangci.yml: remove and replace deprecated and archived linters
* Client: pass credentials when calling WebSocket API methods
* API: require ServiceAccountRoleComputeWrite role for port forwarding
* Use Buf
* Rename Poll() RPC method to Watch()
* Split Rendezvous into two parts: Watcher and Proxy (#32)
* Split Rendezvous into two parts: Watcher and Proxy
* Implement Proxy cancellation
* Use Protocol Buffers structure directly in Watcher
* Fix TestWatcher after switching to Protocol Buffers structure
* portForwardVM(): ensure we also check for gin's context
Nikolay Edigaryev