Merge #3738

3738: Implement ra_proc_macro client logic r=matklad a=edwin0cheng

This PR add the actual client logic for `ra_proc_macro` crate:

1. Define all necessary rpc serialization data structure, which include `ra_tt` related data and some task messages. Although adding `Serialize` and `Deserialize` trait to ra_tt directly seem to be much easier,   we deliberately duplicate the `ra_tt` struct with `#[serde(with = "XXDef")]` for separation of  code responsibility. 
2. Define a simplified version of lsp base protocol for rpc, which basically copy from lsp-server code base. 
3. Implement the actual `IO` for the client side progress spawning and message passing.

Co-authored-by: Edwin Cheng <[email protected]>

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