feat: Retrieve request metadata from the server #86
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Following the same implementation as grpc-go: https://github.com/grpc/grpc-go/blob/master/Documentation/grpc-metadata.md#sending-and-receiving-metadata---server-side
Clients have the ability to add metadata to requests, but the servers cannot access it. This change allows servers to access the request's metadata from the RPC context. I believe this also resolves #42.