chore: Add subscription_id support for GetEventSubSubscriptions

[Awakened-Redstone]

https://dev.twitch.tv/docs/api/reference/#get-eventsub-subscriptions specifies status, type, user_id, subscription_id and after as valid query parameters, but the GetEventSubSubscriptionsAsync method only had status, type, user_id and after

[MrLawbreaker]

This will be a breaking change for existing calls. Had similar with #417 with a new parameter.

Maybe this should also be a new method with a new Request class as parameter and marking this old one as obsolote?

[Awakened-Redstone]

Maybe this should also be a new method with a new Request class as parameter and marking this old one as obsolote?

That would work.
I'm unsure as on how C# will treat it (as I'm new to C#, specially), but another option I see is to have a 6 parameter (with the same structure as the old method) and a 7 parameter one, marking the 6 parameter one as obsolete.

I'll approach the preferred method by the TwitchLib team.

[AoshiW]

another option I see is to have a 6 parameter (with the same structure as the old method) and a 7 parameter one

This is a bad idea. The original method has a default value set for all parameters (and all parameters are of type string), so this would cause problems.

So either I would merge it as it is or create a new method that will receive the "request" class.

Note: I looked through all the "Reques" classes, and they all represent the "body" of the request. So perhaps it would be better to use a slightly different suffix to distinguish between the body and the query. But maybe I'm overthinking it.

It would be better if someone from the TwitchLib team who is working on this project could tell his opinion