Support displaying raw response size before decompression

[gamer2810]

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Use-case: Checking if server's compression is working.

Currently with the very verbose (-vv) output, I can see the estimated data size of the response:

However, that is the message size after decompression. The logs on the server said only 2340 bytes has been sent:

When I turned off compression on the server, the message size is indeed around ~17KB:

To check compression, I currently need to turn on debug logging on the server which creates lots of logs and is impossible to do on production servers. Could you guys help adding output for raw response message size and the grpc-encoding header?