Pretty print JSON on RPC payloads

[accordeiro]

We already pretty print JSON on the JSON<>XDR functionality.

I'd like to have the same monospaced, collapsible, syntax-highlighted JSON on RPC payloads, such as on this screen:

This will enable easier parsing / browsing of the API call that will be submitted.

[Shaptic]

@accordeiro if you want, you guys can wait until we release the next minor version of RPC which will let you get the responses as JSON by default via an xdrFormat: "json" parameter! 👍

[janewang]

@Shaptic I can't wait for the next version of the RPC with JSON! 🎉

This is the payload that's submitted to the RPC endpoint that we want to prettify. We should consistently prettify JSON in Lab

FYI cc @sdfcharles

[janewang]

Discussed with @quietbits that we will change to pretty print without the toggle