feat: Support default_values for Select of type ComponentType.mentionable_select and ComponentType.channel_select

[doluk]

Summary

Looking at https://discord.com/developers/docs/components/reference#user-select I noticed that there is support for preselecting users, channels, roles, mentionables for the non string selects. This pr adds support for this.

Information

• [ ] This PR fixes an issue.
• [x] 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, typehinting, examples, ...).

Checklist

• [x] I have searched the open pull requests for duplicates.
• [x] If code changes were made then they have been tested.
  • [x] I have updated the documentation to reflect the changes.
• [ ] If type: ignore comments were used, a comment is also left explaining why.
• [x] I have updated the changelog to include these changes.

[Paillat-dev]

@NeloBlivion Would this interfere with #2707 ?

[doluk]

I addressed most of the review comments, the two left open are something which need a final decision on what to do. @Paillat-dev @JustaSqu1d Hope the example I added is suitable

[Paillat-dev]

@doluk can you take a look at the merge conflicts ?

[doluk]

the component v2 merge created that, I am not sure there is an easy way out of it. I was thinking about opening another pr from the current main instead of trying to resolve the conflicts somehow

[Paillat-dev]

@doluk I am going to try the merge and we'll see..

[Paillat-dev]

@doluk I merged it but I am not sure it is all good, would you mind taking a look ?

[plun1331]

@doluk updates?

[Lulalaby]

Would be nice if either

• it's being worked on by you @doluk
• or taken over by one of the contributors / core team

Another upcoming feature (in a few~ish weeks) depends on that as well

[Lulalaby]

Let's do a clean new pr