initial prep_NISAR

[ehavazli]

This PR includes a new notebook to prepare NISAR data to run through ATBD methods. Currently only ionospheric correction layer is extracted. A script for extracting layers from NISAR data is obtained from ADT and included here with it's own history. Another PR will follow for the automated extraction and loading of troposphere and solid earth tides layers.

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[rzinke]

Worked for me. Properly set up MintPy/inputs files as expected.

[katia-tymofyeyeva]

Please don't merge - the notebook does not work with the rest of the workflow and real NISAR data. Several changes have to be made, including creating the mintpy configuration file, creating a mask file and others. The rest of the workflow also needs some adaptations to work with NISAR data. I am making the changes and will commit as soon as they are ready. Thanks! -Katia

[ehavazli]

@katia-tymofyeyeva

• Can you please be more specific what didn't work for you? I tested again from scratch and everything worked as intended.
• I added the MintPy configuration file generation.
• Mask files are generated in later stages from the data (e.g., coherence or connected component based) according to user needs. I don't think it is a good idea to mask the data at this stage.
• Please specify the other missing files.
• This PR has been open awaiting review for a long time. The adaptations for the rest of the workflow was not initially part of this PR so I don't think there is a need to discuss them here.

I added my_sites.txt file to this PR so you can test with the sample data and let me know if you find any issues.
Thank you!