Base branch for protocol v2

[masad-frost]

• [x] Define protocol and update doc #111
• [x] Design stream abstractions #118
• [x] Implement stream abstractions
  • [x] ReadStream #130
  • [x] WriteStream #132
• [ ] Use stream abstractions & implement protocol closing semantics
  • [ ] Protocol: Implement close requests from readers
  • [ ] Protocol: Implement half-close
  • [ ] Simple s/Pushable/Stream replacement
    • [x] Client #136
    • [ ] Server #137
• [x] Update schema for INVALID_REQUEST #107
• [ ] Handle/send back INVALID_REQUEST errors
• [ ] Update docs

[masad-frost]

good review, i'll be sending some PRs and we can sync up afterwards

[jackyzha0]

its time.

[masad-frost]

a couple of things left that we'll fix against main