Rap

- description:
- Feature: add limit processor
- Feature: Channel support group
- Feature: func type check
- Feature: support kwargs param
- Fix: Client session.execute not execute coroutine bug
- Fix: can not register asyncgen func
- Refactor: server response api
- Refactor: improvements 'as_first_complete' func and conn result_future
- Remove: remove redis depend by server
- Test: add test and support coverage 90%+
- Style: add mypy

- Fix: client crypto memory bug
- Feature: server support register private func
- Feature: client register support alias & group
- Refactor: server start event&stop event
- Refactor: protocol's event flag & header column & error response

- Remove: remove life cycle
- Feature: add conn result future(listen conn exc)
- Feature: read conn data add listen conn exc
- Feature: print cli func list table
- Feature: channel add method `iter_body` & `iter_response`
- Refactor: refactor client session and add session execute
- Refactor: func manager call func

- description: Add code comments; fix bugs; simplify the protocol
- Doc: add code comments
- Fix: fix server channel crypto&future cancel bug
- Feature: add load event
- Feature: support mutli server
- Feature: add conn sock name and modify client listen future id
- Refactor: refactor func manager
- Refactor: refactor server crypto nonce check

- description: support session & channel
- Feature: add use_session column in header
- Feature: add request_id column in header
- Feature: add channel
- Feature: add processor
- Feature: client:AsyncIteratorCall support client session
- Refactor: func manager
- Refactor: middleware
- Refactor: rap protocol

- description: simplify&mutli server
- Feature: remove life cycle
- Fix: keepalive time init error
- Refactor: refactor server
- Refactor: refactor client, support conn mutli server
- Remove: remove server client_model(one conn one request object)