Feature/make tag helpers more obvious

[stellarsunset]

Add a marker interface for static utility classes for tag access, also add a Tag class that people would probably expect to see.

[codecov]

Codecov Report

❌ Patch coverage is 70.16575% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.62%. Comparing base (8f6b12c) to head (f0267e1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/main/java/io/github/stellarsunset/tiff/Tag.java	70.58%	6 Missing and 4 partials ⚠️
...ellarsunset/tiff/extension/geokey/VerticalCrs.java	0.00%	7 Missing ⚠️
...tellarsunset/tiff/baseline/tag/ResolutionUnit.java	0.00%	4 Missing ⚠️
...ellarsunset/tiff/extension/tag/GeoAsciiParams.java	0.00%	4 Missing ⚠️
...llarsunset/tiff/extension/tag/GeoDoubleParams.java	0.00%	4 Missing ⚠️
...stellarsunset/tiff/baseline/tag/BitsPerSample.java	62.50%	2 Missing and 1 partial ⚠️
...thub/stellarsunset/tiff/baseline/tag/ColorMap.java	60.00%	1 Missing and 1 partial ⚠️
...thub/stellarsunset/tiff/baseline/BiLevelImage.java	0.00%	1 Missing ⚠️
...b/stellarsunset/tiff/baseline/tag/Compression.java	66.66%	1 Missing ⚠️
...b/stellarsunset/tiff/baseline/tag/ImageLength.java	75.00%	1 Missing ⚠️
... and 17 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #37      +/-   ##
============================================
+ Coverage     72.96%   73.62%   +0.66%     
+ Complexity      250      233      -17     
============================================
  Files            70       72       +2     
  Lines          1668     1638      -30     
  Branches        198      188      -10     
============================================
- Hits           1217     1206      -11     
+ Misses          345      342       -3     
+ Partials        106       90      -16     

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