Use PRGA in double factorization ProgRotGateArray

[anurudhp]

Qualtran/qualtran/bloqs/chemistry/df/select_bloq.py

Lines 30 to 33 in 683472a

	class ProgRotGateArray(Bloq):
	r"""Rotate to/from MO basis so-as-to apply number operators in DF basis.
	An actual implementation of should derive from ProgrammableRotationGateArray.

[fdmalone]

I don't think this is actually equivalent. PRGA acts on a single target but this one needs to act on multiple targets. Ideally would be unified with the THC bloq (xref: #573).

[fdmalone]

Perhaps an intermediate step would be to not name this ProgRotGateArray and use something like #579 which may be a lot closer to having a real implementation given all the work on phase gradient rotations etc.