Fix issue 234

[kkappler]

• [x] make initialize_mth5s use mth5.util.helpers.initialize_mth5
• [x] make close_mths_objs a method of KernelDataset

[codecov[bot]]

Codecov Report

Merging #235 (3ee234d) into main (c58c371) will increase coverage by 0.00%. The diff coverage is 90.00%.

@@           Coverage Diff           @@
##             main     #235   +/-   ##
=======================================
  Coverage   77.61%   77.62%           
=======================================
  Files         101      101           
  Lines        5468     5470    +2     
=======================================
+ Hits         4244     4246    +2     
  Misses       1224     1224           

Impacted Files	Coverage Δ
aurora/pipelines/run_summary.py	88.88% <ø> (ø)
aurora/config/metadata/processing.py	73.75% <80.00%> (+2.22%)	:arrow_up:
aurora/pipelines/time_series_helpers.py	73.18% <94.11%> (ø)
aurora/pipelines/process_mth5.py	98.11% <100.00%> (+0.51%)	:arrow_up:
aurora/transfer_function/kernel_dataset.py	80.57% <100.00%> (+0.57%)	:arrow_up:

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