[network] stop generating network protos with rust-protobuf
[network] stop generating network protos with rust-protobuf

Closes: #1210
Approved by: delegate

aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core