GRPC Node Compression about grpc-node

[theogravity]

The flag is found here:

https://github.com/grpc/grpc/blob/master/include/grpc/impl/codegen/compression_types.h#L43

server:

import { Server } from 'grpc'

const server = new Server({
  'grpc.default_compression_level': 2,
})

I've found that by default, the node-based client compresses if the flag is enabled on the server.

You can verify this behavior by using a proxy between the client and server - see #465 for an example of this