Add multi methods and results

[Alex Remizoff]

--> {"jsonrpc": "3.0", "methods": [{"method": "subtract", "params": [42, 23], "id": 1}, {"method": "update", "params": [1,2,3,4,5]}, "id": 2], "id": 1}
<-- {"jsonrpc": "3.0", "results": [{"method": "subtract", "result": 19, "id": 1}, {"method": "update", "error": {"code": -32601, "message": "Method not found"}, "id": 2}], "id": 1}

[Matt (MPCM)]

I think batch in 2.0 mostly overs this scenario: https://www.jsonrpc.org/specification#batch