DataTable: set default filter either on UIColumn#filterValue or custom facet value

[Rapster]

Description

Based on this: #9349 (comment)

In regards to when or when not to utilize the filterValue attribute...I was under the impression that the attribute was to be used if a filter was not explicitly defined in a filter facet via <f:facet name="filter">. Or in other words, the filterValue attribute was to be ignored if I did define a filter facet.

As there are two potential ways to define default value, users are confused which one to used, but more recently users tend to use custom facet filter value due to a "regression"

My solution is here #9349 (comment)

So, maybe the best way to go about it is to support both by simply doing a coalesce 😄 I can propose a fix, but maybe in another issue, your issue is pretty clear as to what is not working /confusing

Describe the solution you would like

support both UIColumn#filterValue and custom facet value, UIColumn#filterValue being priority number 1

Additional context

No response