[Approximation Framework] Extend approximation to single clause boolean queries

[sawansri]

Is your feature request related to a problem? Please describe

Currently single clause boolean queries are unwrapped in BooleanQuery.rewrite() as an optimization in Lucene. This is fine for queries containing a non approximate-able clause but we miss out on potential query speed up if the clause can be approximated.

Describe the solution you'd like

Implement ApproximateBooleanQuery which flattens the boolean query and applies approximation if possible.

Related component

Search:Performance

Describe alternatives you've considered

No response

Additional context

No response