Fix issue 175

[kkappler]

Modifications in this PR enable a column in the dataset_dataframe (aka run_summary) called "channel_scale_factors".

This should be reviewed in future, as using "channel_scale_factors" in general is a workaround, and shouldn't normally be needed, however, over the past while in dev it has been quite useful in debugging errors in metadata.

The point is that I would like this column to be optional, so it should be tested whether this column is required and if it is then add a note to issue #175 about adding that flexibility

[codecov]

Codecov Report

Merging #176 (eb4b5c7) into dev (9054913) will increase coverage by 0.15%.
The diff coverage is 96.07%.

@@            Coverage Diff             @@
##              dev     #176      +/-   ##
==========================================
+ Coverage   68.85%   69.01%   +0.15%     
==========================================
  Files         104      105       +1     
  Lines        5830     5860      +30     
==========================================
+ Hits         4014     4044      +30     
  Misses       1816     1816              

Impacted Files	Coverage Δ
tests/config/test_dataset_dataframe.py	97.29% <ø> (ø)
...ra/test_utils/synthetic/make_processing_configs.py	72.72% <66.66%> (+0.81%)	⬆️
aurora/config/metadata/run.py	74.32% <88.88%> (+2.01%)	⬆️
aurora/config/metadata/station.py	82.81% <100.00%> (+0.84%)	⬆️
aurora/test_utils/synthetic/paths.py	100.00% <100.00%> (ø)
...a/test_utils/synthetic/synthetic_station_config.py	100.00% <100.00%> (ø)
aurora/tf_kernel/dataset.py	69.56% <100.00%> (+1.38%)	⬆️
.../synthetic/test_compare_aurora_vs_archived_emtf.py	97.43% <100.00%> (-0.13%)	⬇️
tests/synthetic/test_synthetic_driver.py	96.66% <100.00%> (+0.83%)	⬆️

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