Enable Brotli compression for RPC requests by default

[GytisCepk]

Motivation

Enabling compression for RPC response bodies have show to significantly drop size of data which needs to be downloaded by the frontend. Right now, only certain RPC requests have Gzip compression enabled.

Also, Brotli compression have shown to have better compression ratio for our RPC requests without additional compressing time.

Changes

• Make Brotli main compression instead of Gzip (if Brotli not supported by the browser, will fallback to Gzip).
• Enable compression for all RPC responses by default (to disable compression for specific RPC request, add following line above definition: @RpcOperation.setPolicy({ allowResponseCompression: false }).