[FEAT] Add Emoji Requests for applications

[kylianpl]

Problem Description

Discord recently added the possibility of adding emoji directly for a discord application, and with it the api similar to guilds to list, get, create, modify and delete them

Proposed Solution

Implement these functions, probably in EmojiRequests as well as the wrappers

Alternatives Considered

No response

Additional Information

No response

Code of Conduct

• I agree to follow the contribution requirements.