Speed up ODGP solver by using an iterator to generate solutions dynamically

[shun0923]

Summary

Add gridsynth_circuit function and speed up ODGP solver using an iterator.

Details

• gridsynth_circuit returns the synthesized circuit representation.
• ODGP solver now generates solutions dynamically via an iterator, reducing memory usage and improving performance.

[shun0923]

Fixes #1

Run example of pygridsynth with a test angle:

python -m pygridsynth 0.7853981633974483 1e-6 --dps 256 --verbose --time

Example output:

to_upright_set_pair: 0.006000041961669922 s
------------------
time of solve_TDGP: 16.315698623657227 ms
time of diophantine_dyadic: 7.107734680175781 ms
z=DOmega(ZOmega(-1112890, 68153, 213961, 431805), 41), w=DOmega(ZOmega(-542341, 567444, -260146, -199542), 41)
------------------
time of decompose_domega_unitary: 20.524978637695312 ms
total time: 50.9488582611084 ms
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