Use `grpc` compression

[cthulhu-rider]

• https://github.com/grpc/grpc-go/blob/master/Documentation/compression.md

we've never used it. In theory, should reduce amount of node-to-node transmission data and boost system performance overall

requires in-depth research and analysis, in the current situation it refers to micro-optimization: there are plenty of optimization TODOs regardless of the message compression