feat: add jsonrpc gateway support

[alidevjimmy]

Description

Added JSON-RPC gateway support for gRPC server using protoc-gen-jrpc-gateway protoc generator plugin and jrpc for json-rpc server.
I tested it manually and it works fine but I'll write tests for it.

[b00f]

@alidevjimmy, you can use commands like make fmt and make check to ensure that linting and formatting pass.

[b00f]

You need to add a function here like:

// RegisterBlockchainMethods registers the JSON-RPC methods for the Blockchain service with "mux".
// The handlers convert JSON-RPC requests to gRPC requests and forward them to the gRPC endpoint over "conn".
// The results are then converted back to JSON-RPC responses.
func RegisterTransactionHandler(ctx context.Context, mux *jgw.ServerMux, conn *grpc.ClientConn) error {
	return mux.RegisterMethods(ctx, BlockchainMethods(NewTransactionClient(conn)))
}

[b00f]

You can give a type to: func(ctx context.Context, params json.RawMessage) (interface{}, error)

[codecov]

Codecov Report

Merging #1183 (456b274) into main (41d10ee) will decrease coverage by 0.04%.
The diff coverage is 68.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1183      +/-   ##
==========================================
- Coverage   81.37%   81.33%   -0.04%     
==========================================
  Files         179      179              
  Lines        9481     9496      +15     
==========================================
+ Hits         7715     7724       +9     
- Misses       1381     1386       +5     
- Partials      385      386       +1