Replace everything by missing if gdalfile throws error

[felixcremer]

This will allow to read Sentinel-1 data even though one single time step is not available.

This also saves the rqatrend result locally and rechunks it into S3.

[felixcremer]

This also reintroduces the classification into UInt8 classes.

The tests are passing locally.

[meggart]

Maybe we should add to the docs that a value between 0 and 254 is returned and 255 corresponds to missing. Also, the kwargs lowerbound and upperbound are not documented

[codecov]

Codecov Report

❌ Patch coverage is 65.45455% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.55%. Comparing base (d0863a2) to head (0a6f428).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main.jl	54.83%	14 Missing ⚠️
src/auxil.jl	71.42%	4 Missing ⚠️
src/rqatrend.jl	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
+ Coverage   56.76%   66.55%   +9.78%     
==========================================
  Files           6        6              
  Lines         266      287      +21     
==========================================
+ Hits          151      191      +40     
+ Misses        115       96      -19     

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