utils0.incidence_angle: read from metadata directly if available for dimension==0

[taliboliver]

Adding option to read center incidence angle from attribute file if available and use it as preferred option.

Proposing these changes after encountering a range_n value smaller that the acquisition height for UAVSAR dataset swatch_00540.

This error was also encountered by @alhandwerger

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[yunjunz]

Thank you @taliboliver for the fix, LGTM.