[cli][dev-menu][go] add react devtools (#21462)

# Why

close ENG-7468
close ENG-7469

# How

- [cli] add websocket proxy to forward react-devtools events.
- [cli] add static page for react-d

[cli][dev-menu][go] add react devtools (#21462)

# Why

close ENG-7468
close ENG-7469

# How

- [cli] add websocket proxy to forward react-devtools events.
- [cli] add static page for react-devtools frontend. since react-devtools only ships commonjs format, this pr tries to use jspm to support it on browsers.
- [dev-menu][go] listen `reconnectDevTools` metro websocket event and send `RCTDevMenuShown` to js for app to reconnect devtools websocket

# Test Plan

manual test only. please let me know if there's any proper points to add unit tests

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