[Block Library - Post Terms]: Add dynamic variations of feeds

[carstingaxion]

What problem does this address?

I did not find a blocky way to get a list of all feeds a reader may want to subscribe to, for a given post. I was looking for a block equivalent to get_term_link().

Once again: for GatherPress, I created a block variation of the post-terms block that seemed so simple and general, that I thought it might be better to ask, if we don’t want to support that from core.

What is your proposed solution?

I’d like to take #39837 one step further and register another set of core/post-terms variations which will be populated with the feed urls of the selected terms.

While the block should use ‚rss‘ as its default feed type, a radio control could be pre-populated with the registered feed types to let an editor choose from.

In my GatherPress use-case, I wanted to use such a block to show the subscribe-able iCal endpoints.

Because I did this already for GatherPress, I can easily share some code or even create a PR.

[carstingaxion]

Friendly ping asking for your opinions: @paaljoachim, @ntsekouras and @jeherve

[paaljoachim]

I went ahead and posted in the PR: #39837
So that people there would get information about this issue.

[carstingaxion]

Cool, thank you @paaljoachim !