isce_utils: add filter_goldstein()

[yunjunz]

Description of proposed changes

• utils.isce_utils: add/wrap filter_goldstein() from isce2 for easy reuse.

• utils.isce_utils.unwrap_snaphu(): rename defo_max to max_defo to be more intuitive

• cli/view.py: print out warning msg if --faultline is specified for radar-coded file

• docs/api/data_structure.md: update syntax

Reminders

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• If modifying functionality, describe changes to function behavior and arguments in a comment below the function declaration.
• If adding new functionality, add a detailed description to the documentation and/or an example.