Initialize ctd_io module

[mvkovatch3]

• Consolidate merge_codes and report_ctd into new ctd_io module
  • (may just re-name back to io – conflict with standard library?)
• Tests for ctd_io
• Start incrementally adding mypy testing

[codecov[bot]]

Codecov Report

Merging #39 (e0ef904) into main (5ce16ae) will increase coverage by 1.20%. The diff coverage is 91.30%.

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   19.09%   20.29%   +1.20%     
==========================================
  Files          27       26       -1     
  Lines        2996     2858     -138     
  Branches      352      347       -5     
==========================================
+ Hits          572      580       +8     
+ Misses       2422     2276     -146     
  Partials        2        2              

Flag	Coverage Δ
pytest	20.29% <91.30%> (+1.20%)	:arrow_up:

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Impacted Files	Coverage Δ
ctdcal/process_ctd.py	11.19% <33.33%> (-1.89%)	:arrow_down:
ctdcal/io.py	100.00% <100.00%> (ø)

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