Refactor library recycler adapters

[eliserichards]

Related to #15577, #16215

Refactor the recycler views in history, bookmarks, downloads (and maybe logins too?) to use https://developer.android.com/reference/androidx/recyclerview/widget/ConcatAdapter (or another option).

Current implementation does some weird stuff in order to have the Delete button in the scroll view: https://github.com/mozilla-mobile/fenix/blob/655a5cbf5439c162b6c221031dc7f2606eb0bc9f/app/src/main/java/org/mozilla/fenix/library/history/HistoryAdapter.kt#L47

fun updateMode(mode: HistoryFragmentState.Mode) {
        this.mode = mode
        // Update the delete button alpha that the first item holds
        if (itemCount > 0) notifyItemChanged(0)
    }

┆Issue is synchronized with this Jira Task

[jonalmeida]

When we used the ConcatAdapter in the tabs tray it came with some side-effects that are worth noting:

• If the first adapter takes a while to load, the contents of the remaining items will be added and animated in first and then pushed down to show the contents of the first adapter. You can read more about this in the tabs tray bug for it.
• ItemDecoration can be annoying if you need to have different decorations for each adapter's ViewHolders and now you need to combine them into one.

[stale[bot]]

See: https://github.com/mozilla-mobile/fenix/issues/17373 This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[eliserichards]

Removing "won't-fix". This issue may still be valid.

[stale[bot]]

See: https://github.com/mozilla-mobile/fenix/issues/17373 This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.