`topological_sort` for `datanames(teal_data())`

[m7pr]

Part of https://github.com/insightsengineering/teal/pull/1253

The aim of this PR is to apply topological_sort for datanames() of teal_data() object. The order of topological_sort would put parent dataset names before child dataset names.

I located that we need to apply topological_sort for datanames() when

• we create a new teal_data() object
• when we overwrite datanames(x) <- ""
• when we overwrite join_keys(x) <- ""

The join_keys specify relation between child and parent, so each time they change the order of topological_sort need to be recalculated.

@averissimo since you are the grand master of join_keys do you see any other place where we should update datanames(teal_data()) when join_keys gets changed? I was thinking about

• names(join_keys) <-
• parents(join_keys) <-

Would you use your wisdom and shred some light of your thoughts on those 3 remaining methods/functions?

[m7pr]

For now, let's ignore

[m7pr]

Closing in favour of https://github.com/insightsengineering/teal/pull/1280