- Add `from_bytes` in RSAPublicKey and Secp256k1PublicKey
- Add `pubkey_from_protobuf` to parse pubkey from protobuf
- Verify key and peer_id in `InsecureSession.run_handshake`
Instead of accessing its reader and writer directly.
TODO: considering add `ReaderWriterCloser` interface and let connection
and stream inherit from it.
Update Makefile to handle the import in `plaintext.proto`.
Import path is modified to be relative to the project root.
And we run `protoc` from where `Makefile` locates, i.e. the project
root.
Reference:
- plaintext.proto: 62b2c6c482/sec/insecure/pb/plaintext.proto
