window.ethereum.request supporting batch arrays

[shanejonas]

Ideally window.ethereum.request supports passing an array of requests in to support JSON-RPC Batching.

Batching is in the JSON-RPC protocol already we just haven't supported it yet via window.ethereum.request. It is supported however with window.ethereum.send, so the functionality already exists in metamask, we just need to add it as a valid parameter and handle it the same way window.ethereum.send does.

[dadkilll02]

window.ethereum.request``window.ethereum.send