Add tx broadcast gRPC endpoint (#7852)

* WIP tx/broadcast grpc endpoint

* fix lint

* fix proto lint

* Update service.proto

* resolve conflicts

* update service.proto

* Update service.proto

* review changes

* proto lint

* Switch to txraw

* Add check breaking at the end

* Fix broadcast

* Send Msg on SetupSuite

* Remove proto-check-breaking

* 1 validator in test

* Add grpc server tests for broadcast

* Fix grpc server tests

* Add some changes

* Add ress comments

* Add table tests for tx service

* Add test for mode

* Add simulate tests

* Add build flag back

* Revert custom stringer for enum

* Remove stray logs

* Use /txs/{hash}

Co-authored-by: Amaury Martiny <amaury.martiny@protonmail.com>
Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

Makefile

@@ -357,7 +357,7 @@ devdoc-update:
 ###                                Protobuf                                 ###
 ###############################################################################
 
-proto-all: proto-format proto-lint proto-check-breaking proto-gen
+proto-all: proto-format proto-lint proto-gen
 
 proto-gen:
 	@echo "Generating Protobuf files"