Application fields changes

[Puncher1]

This PR adds following missing application fields:

• discoverability_state
• discovery_eligibility_flags
• explicit_content_filter
• hook
• interactions_event_types
• interactions_version
• is_monetized
• monetization_eligibility_flags
• monetization_state
• rpc_application_state
• store_application_state
• verification_state

and changes following fields:

• role_connections_verification_url type from string to ?string

[JustinBeckwith]

Thanks for the PR! While a lot of these fields may be included in the response, not all fields that come back in a response are part of the documented, supported API. For that - you really want to be looking at what's available in the Open API spec: https://github.com/discord/discord-api-spec/blob/main/specs/openapi.json#L26277

The only field that should be included is explicit_content_filter.