Fix 4193 - set hidden_by_parent when adding to displayio group

[Neradoc]

Fixes #4193 using the proposed simple solution.

When appending a layer (Group or TileGrid) to a displayio group, set the hidden_by_parent attribute to true if the group (the new "parent") is either hidden or hidden_by_parent. The *_set_hidden_by_parent functions propagate the value further down the tree as necessary.

This fixes in particular updating text labels while they are hidden, like you would with a pagination system, since it involves inserting one or more TileGrids inside the label's Group, triggering the issue.

Tested on the Clue with the code from the issue and some test code updating text labels while hidden.

[tannewt]

Thanks for the fix!