Enumeration Support

[bnlawrence]

Description

This PR provides support for Enumeration datatypes, both as standalone datatypes, and as datatypes used directly within integer enumerations.

Closes #85

Checklist

• This pull request has a descriptive title and labels
• This pull request has a minimal description (most was discussed in the issue, but a two-liner description is still desirable)
• Unit tests have been added (if codecov test fails)
• Any changed dependencies have been added or removed correctly (if need be)
• If you are working on the documentation, please ensure the current build passes
• All tests pass

[codecov]

Codecov Report

❌ Patch coverage is 84.07080% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.58%. Comparing base (04f5199) to head (4a5dede).
⚠️ Report is 217 commits behind head on main.

Files with missing lines	Patch %	Lines
pyfive/h5t.py	62.96%	9 Missing and 1 partial ⚠️
pyfive/dataobjects.py	72.22%	2 Missing and 3 partials ⚠️
pyfive/h5d.py	83.33%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
+ Coverage   71.93%   72.58%   +0.65%     
==========================================
  Files          11       11              
  Lines        2423     2499      +76     
  Branches      364      379      +15     
==========================================
+ Hits         1743     1814      +71     
  Misses        583      583              
- Partials       97      102       +5     

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[valeriupredoi]

@bnlawrence you are fine wrt coverage see https://app.codecov.io/gh/NCAS-CMS/pyfive/tree/enum_and_friends - it's just that your HEAD was off a different branch (Kai's branch that had evolved in the meantime), but Codecov looked at that initial state branch to compare; it's always a good idea to start your work off the latest main