feat: send all paste keystrokes to backend (#789)

* feat: send all paste keystrokes to backend

* feat: cancel paste mode

* wip: send macro using hidRPC channel

* add delay

* feat: allow paste progress to be cancelled

* allow user to override delay

* chore: clear keysDownState

* fix: use currentSession.reportHidRPCKeyboardMacroState

* fix: jsonrpc.go:1142:21: Error return value is not checked (errcheck)

* fix: performance issue of Uint8Array concat

* chore: hide delay option when debugMode isn't enabled

* feat: use clientSide macro if backend doesn't support macros

* fix: update keysDownState handling

* minor issues

* refactor

* fix: send duplicated keyDownState

* chore: add max length for paste text

---------

Co-authored-by: Adam Shiervani <adam.shiervani@gmail.com>

webrtc.go

@@ -266,6 +266,8 @@ func newSession(config SessionConfig) (*Session, error) {
 		if connectionState == webrtc.ICEConnectionStateClosed {
 			scopedLogger.Debug().Msg("ICE Connection State is closed, unmounting virtual media")
 			if session == currentSession {
+				// Cancel any ongoing keyboard report multi when session closes
+				cancelKeyboardMacro()
 				currentSession = nil
 			}
 			// Stop RPC processor