Updated resampling resolution comparison

[hb6688]

Major Updates:

1. Added comments.
2. Updated following scripts:
   1. dswx_ni_runconfig.py
   2. mosaic_gcov_frame.py

Updated functions in dswx_ni_runconfig.py

1. get_freq_rtc_hdf5
2. get_res_rtc_hdf5
3. get_pol_rtc_hdf5
4. get_freq_rtc_hdf5
5. check_rtc_frequency
6. read_rtc_polarization
7. read_rtc_resolution
8. compare_rtc_resolution (will remove after review)
9. compare_rtc_polariztion
10. verify_nisar_mode

Updated schema and configuration file:

1. removed resamp_required parameter. It is now determined in dswx_ni_runconfig.py
2. resamp_out_res is dependent on highest resolution of all inputs

[oberonia78]

@hb6688 I hope you add more descriptions. nisar_uni_mode and resamp_required, and resamp_out_res are determined from dswx_ni_runconfig.py, not from user. I think this should be clarified and mentioned here.

[oberonia78]

Since we've already discussed about the logic to mosaic the images when two RTCs have different spacing and modes, I understand why you implemented like this. However, I hope you add more explanation in the script. It would be easier to read and follow in future when we find the issue.