[Feature] Thread user member & thread members pagination

[Misha-133]

This PR adds support for the guild member property of thread member & thread member pagination.

Changes

• RestThreadChannel.GetUsersAsync() now wraps RestThreadChannel.GetThreadUsersAsync() to keep old code working
• add RestThreadChannel.GetThreadUsersAsync() method which returns an IAsyncEnumerable
• add GuildUser property to IThreadUser

[csmir]

Discord API changes are considered exempt from our semantic versioning, since there is no way to prevent these changes from happening on Discord's end. Though, I would like some input here. Do we keep the old method, and allow it as standard for top 100 members? This way, people who upgrade won't need any refactors

[Misha-133]

Discord API changes are considered exempt from our semantic versioning, since there is no way to prevent these changes from happening on Discord's end. Though, I would like some input here. Do we keep the old method, and allow it as standard for top 100 members? This way, people who upgrade won't need any refactors

I mostly agree with your statement
My point is that having multiple similarly named method would create some unnecessary confusion between them.

But now thinking about it - we could have the old method wrap the new one so it would keep its full functionality while also creating a new method that would allow to have more control over the process.
I think this would be a better way of implementing this functionality
I'll make necessary changes shortly.

[csmir]

I advice marking the old method as obsolete. This way people will be notified to make changes, and future us can go and remove it completely for v4.