Filters V2: allow to list, create and delete

[xvello]

For https://codeberg.org/xvello/mastoml I needed to list, add and delete v2 filters through this client.

I did a quick and dirty addition first to unblock me, and wanted to check in with you @dscottboggs before polishing the PR for review:

• Will you have the time to review this PR?
• Should the methods & types around the v1 filters API be kept or removed? FYI, get_filter currently uses the v1 endpoint but the v2 type, and fails to unmarshall the response
• I can add a update_v2_filter query once the rest is merged

Feel free to directly push on the branch or suggest changes in a review.

[dscottboggs]

Please note the existence of #54, the comb branch, and, more specifically to this PR, commit abafaf224c8423e68cc0489888f9e2a412048c72

If you have any capacity to offer towards the v2 push, it would be appreciated. I can review PRs, but am pretty buried with other projects right now to work on it myself.

[xvello]

Hello @dscottboggs, this PR builds on top of https://github.com/dscottboggs/mastodon-async/commit/abafaf224c8423e68cc0489888f9e2a412048c72, uses the new struct and wires the associated endpoints that were not yet wired.

Since this PR has been closed on sight, I'll hard fork for my personal use.

[dscottboggs]

Yes, that change was made before the decision to avoid further breaking changes in the v1 release cycle. All breaking changes must be a part of the v2. It's not that I don't appreciate the effort, but I have a commitment to other users of this library to maintain semver compatibility. As I said before, I closed this PR because it is targeting the wrong branch and duplicating work that has already been done. Your contributions, if they maintain semver compatibility, are more than welcome. If semver compatibility is not something you're interested in, you're also more than welcome to maintain a hard fork.

I apologize if I've made you feel as though I don't appreciate the effort.