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Add demodulation/remodulation to Resample#237

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Tyler-g-hudson wants to merge 36 commits intoisce-framework:developfrom
Tyler-g-hudson:resamp-modulation
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Add demodulation/remodulation to Resample#237
Tyler-g-hudson wants to merge 36 commits intoisce-framework:developfrom
Tyler-g-hudson:resamp-modulation

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This PR is a copy of an older one that had stalled, now rebased to fit the current most up-to-date status of ISCE3. The update adds modulation and demodulation to the standard Resample v2 code as an optional step in the process. This can be achieved by passing phase carriers (LUT2d or Poly2d objects) to resamp_slc_blocks. Remoduation can be activated by doing the above and passing remodulate=True to the function.

This behavior is not expected to modify any NISAR workflow, as the default behavior of the function is to skip demodulation/remodulation.

+ Added wrapper functions in python
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