Obtain an inventory of data tables within an app's code

[tomherden]

I’ve looked for but haven’t found a way to obtain an iterable containg the data tables used within an app.

This feature that has been sought by others in the past:

@stefano.menci

I don’t know why app_tables doesn’t give you the list.
I have an app that allows to pick a table, but I have also a manually maintained table with the list of pickable tables.