Split up lsl.misc.ionosphere to make it easier to maintain

[jaycedowell]

This PR converts lsl.misc.ionosphere into sub-module that separates out the different data sources/services. Although the interface exposed to the user does not change I think having each data source contained in its own file makes it easier to maintain/add new data sources.

[codecov]

Codecov Report

❌ Patch coverage is 80.96357% with 162 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.09%. Comparing base (d675af2) to head (ff5f971).

Files with missing lines	Patch %	Lines
lsl/misc/ionosphere/_glotec.py	17.39%	76 Missing ⚠️
lsl/misc/ionosphere/__init__.py	88.88%	27 Missing ⚠️
lsl/misc/ionosphere/_utils.py	86.24%	26 Missing ⚠️
lsl/misc/ionosphere/_ustec.py	91.37%	17 Missing ⚠️
lsl/misc/ionosphere/_emr.py	86.20%	4 Missing ⚠️
lsl/misc/ionosphere/_igs.py	86.20%	4 Missing ⚠️
lsl/misc/ionosphere/_jpl.py	83.33%	4 Missing ⚠️
lsl/misc/ionosphere/_uqr.py	83.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   84.02%   84.09%   +0.06%     
==========================================
  Files          83       91       +8     
  Lines       24368    24415      +47     
==========================================
+ Hits        20475    20531      +56     
+ Misses       3893     3884       -9     

Files with missing lines	Coverage Δ
lsl/misc/ionosphere/_code.py	100.00% <100.00%> (ø)
lsl/misc/ionosphere/_emr.py	86.20% <86.20%> (ø)
lsl/misc/ionosphere/_igs.py	86.20% <86.20%> (ø)
lsl/misc/ionosphere/_jpl.py	83.33% <83.33%> (ø)
lsl/misc/ionosphere/_uqr.py	83.33% <83.33%> (ø)
lsl/misc/ionosphere/_ustec.py	91.37% <91.37%> (ø)
lsl/misc/ionosphere/_utils.py	86.24% <86.24%> (ø)
lsl/misc/ionosphere/__init__.py	88.88% <88.88%> (ø)
lsl/misc/ionosphere/_glotec.py	17.39% <17.39%> (ø)

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