isce_utils.get_processor(): use *.track.xml file to identify alosStack/2App

[yunjunz]

Description of proposed changes

• utils.isce_utils:

  • get_processor(): use *.track.xml file to identify the isce2 sub-type processor of alosStack or alos2App.
  • get_full_resolution(): account for A/RLOOKS while calculating the full resolution size.
  • the above two changes allow the multilook number and resolution conversion for alosStack and alos2App (https://github.com/insarlab/MintPy-tutorial/tree/main/applications/calc_multilook_number.ipynb).

• docs/dir_structure: shorten template input for alosStack

• cli.multilook.py: update example usage for clarity

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