Feat: support custom rpcs

[josepot]

They shouldn't be fully typed or anything, just read what's in the rpc_methods and facilitate those rpc interactions

[voliva]

From our 2025 proposal:

These can sometimes be useful, so we will add a new section for RPC Calls, with a specific UI for standardized ones (JSON-RPC Spec) and a generic one for unknown ones, coming through rpc.rpc_methods.

Probably also allow to pass in any method, in case the RPC is hiding some methods the user wants to use.

[josepot]

Probably also allow to pass in any method, in case the RPC is hiding some methods the user wants to use.

Exactly, yes! We can have a dropdown with the list of methods declared in the rpc_methods and also allow a custom one that's not from the list.