Support for getting recently bookmarked items

[grigoryk]

We'll need this for some upcoming feature work.

Basically, three ways of doing this:

1. expose dateAdded/lastModified timestamps in our BookmarkNode type (these are already available to us over FFI); to get recent, fetch the entire tree and perform an in-memory filter.
2. add a places API specifically for this purpose (which will perform this work entirely in SQL).
3. keep track of recently bookmarked items in some auxiliary storage

(1) is likely the slowest, but quick to do. (2) will be certainly faster, but the most work. However, it's not that much work, we should be able to easily add this additional API to A-S.

(3) seems wrong to me entirely, given that (1) and (2) exist.

┆Issue is synchronized with this Jira Task

[eliserichards]

Needed for https://jira.mozilla.com/browse/FNX-22339

[eliserichards]

Looks like the Places API already supports this functionality for recently Added, not recently Edited: https://github.com/mozilla/application-services/blob/f6ed9047aa79b4ce8745022b3bf0ff414d27c13e/components/places/android/src/main/java/mozilla/appservices/places/Bookmarks.kt#L255

[eliserichards]

AS pull request: mozilla/application-services#4181

[grigoryk]

Left a comment on the A-S PR (we probably don't want recently modified stuff).

But, let's expose getRecentBookmarks API in A-C for now!