Add support for getting and editing integration_types_config application field

[Soheab]

Summary

This PR adds support for getting and editing the integration_types_config field for applications.

I exposed it as default_x_install_params properties instead of an object that parses it because I find the inner oauth2_install_params object very unnecessary.

Something to note, setting default_guild_install_x and not default_user_install_x will disable default_user_install_x and I'm not sure if discord.py should handle or tell the user that, if, where and how.

Relevant API Docs:

• https://discord.com/developers/docs/change-log#march-18-2024-api-changes
• https://discord.com/developers/docs/resources/application#application-object

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[Rapptz]

Hm. This API feels.. kinda stinky to be blunt. It's overly verbose and repetitive but I'm unsure how to make it better as it stands. Maybe the separate objects would be cleaner, I don't know.