RFC: Define discord type using schema library

[H01001000]

Current situation/status/issue:

• Discord type are defined with interface
• No way to validate types
• Can't generate fake data with type

Propose:
Define discord type with schema library such as (ajv, zod, yup, etc), then generate type from it.

We can achieve:

• Access type in normal js
• Test against discord real data for validation
• Generate mock/fake discord payload from schema

[MatthewSH]

I think having something like Zod could definitely open up opportunities to ensure safety specifically in our rest package. Right now we just use TypeScript to assume it's fine, we could have an optional setting that enables Zod (for example) validation that ensures the values are parsed.

I'd be totally on board with this and if it's done right we could make it a non-breaking change in v19. The amount of effort it would take would be huge though.

I'm completely for this and would love to see it move out of RFC.