p-columnFilter support for p-treeTable

[Maid-Sabanovic]

Right now, p-table has a very powerful and declarative filtering API (column filters, menu/overlay filters, match modes, custom templates, etc.).
With p-treeTable, filtering is much more limited: basically filterMode, filterGlobal, and manual inputs per column.

If you want the same filtering behavior and UX as p-table, you currently have to rebuild everything yourself (custom inputs, match modes, UI, logic), which leads to a lot of duplicated and inconsistent code—especially in apps that use both components.

It would be great if p-treeTable could reuse or support:

• p-columnFilter

• menu/overlay based filters

• match modes and custom filter templates per column

I know tree data adds some complexity (lenient vs strict), but even partial parity with p-table filters would already be a big improvement.

Curious to hear your thoughts