bugfix for `coord.lalo2yx()` when lat/lon have diff sizes

[yunjunz]

Description of proposed changes

• objects.coord.coordinate:

  • _clean_coord(): 1) take two arg instead of one, and ensure the two coords have the same size, following the changes in https://github.com/insarlab/MintPy/pull/1153; 2) support None as input
  • lalo2yx/yx2lalo(): support None as inputs

• subset.subset_input_dict2box(): use None as input to convert one type of coord only.

• utils.arg_utils.add_subset_argument(): remove the unused option name alias (--suby/x/lat/lon), as they are not very readable and not frequently used.

Reminders

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