Implement Open RPC specification for API

[Neylix]

Is your feature request related to a problem?

Since we swithed ou APIs from REST to JSON RPC, we should use a standardized way to format and expose those API. We can do this by using the Open RPC specification.

Describe the solution you'd like

We need to create a new Open RPC document and respect all the required specification.

This require to use JSON Schema over Ecto for validating request format / data.

Currently there is no easy way to manage OpenRPC document in Elixir. We could create a new library to validate and build OpenRPC document.

Additional context

Open RPC created a playground to help users exploring the APIs and testing them (like Swagger). There is a plugin for docusaurus to integrate the playground into the documentation : https://github.com/MetaMask/docusaurus-openrpc

Epic

No response