Add metimage high res srfs

[adybbroe]

This PR adds a script to convert the high resolution SRFs (under export control) in HDF5 format to the pyspectral internal format.

• Closes #xxxx
• Tests added
• Tests passed: Passes pytest pyspectral
• Passes flake8 pyspectral
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.17%. Comparing base (7a61fdf) to head (1032219).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #286   +/-   ##
=======================================
  Coverage   91.17%   91.17%           
=======================================
  Files          25       25           
  Lines        2673     2673           
=======================================
  Hits         2437     2437           
  Misses        236      236           

Flag	Coverage Δ
unittests	91.17% <ø> (ø)

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[gerritholl]

What does export control mean? I only know this from a US context (ITAR).