Add unary iteration bloq from Cirq-FT

[tanujkhattar]

Part of Qualtran & Cirq-FT Integration

This is working sooooo nicely. Notice the assert_valid_bloq_decomposition in the tests for unary iteration :)

bloq = ApplyXToLthQubit(2, 4, 2)
cbloq = bloq.decompose_bloq()
draw_musical_score(get_musical_score_data(cbloq))

[fdmalone]

Very nice. bloq_counts and get_bloq_counts_graph work as expected too.

[fdmalone]

 {Split(n=4): 1,
  Join(n=2): 2,
  TGate(): 16,
  ArbitraryClifford(n=2): 58,
  CirqGateAsBloq(gate=(cirq.Y**0.5)): 7,
  CirqGateAsBloq(gate=(cirq.Y**-0.5)): 7,
  CirqGateAsBloq(gate=cirq.CZ): 7,
  Join(n=4): 1,
  Split(n=2): 2})

[fdmalone]

Is there anything to review here or is this just copy paste? It could be nice to add some bloq drawings to the notebook in the future.

[tanujkhattar]

This is just copy paste for now. Let's add improvements in follow up PRs to keep the complexity manageable.

I'll start moving other algos once this is merged.

[fdmalone]

LGTM