Forward console from snap to dapp console

A lot of people are having trouble getting logs from background.html console log.

Since we control the environment, we can catch all `console.logs` in the sandbox and forward it to all dapps talking with that snap into `window.ethereum` provider and do `console.log` there.

That way, developers will see snap errors in their console log of their application.

Context #959

Review the snap sandbox and background.html logging path, then trace how messages reach the window.ethereum provider; context #959 is the only referenced issue. Done means console output from a snap is forwarded to every connected dapp and appears in that dapp's console.

Written by the indexing model from the issue text.