feat(boards2): improve public realm functions

[jeronimoalbi]

The PR simplifies the implementation of a couple public boards2 realm functions and change them to be up to date with the latest permission handling changes.

These changes also allow a creator of a thread to edit it without permission, or creators of a reply/comment to delete the reply.

Also creators of a thread are allowed to delete it for now. This behavior might change in future PRs.

[Gno2D2]

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[jeronimoalbi]

This will be solved in a following PR

[jeronimoalbi]

PR #3606

[jeronimoalbi]

@x1unix this PR is ready for review 🙏