Add pycolorbar for colormaps and colorbar configurations

[ghiggi]

Prework

• [x] I understand and agree to this repository's code of conduct.
• [x] I understand and agree to this repository's contributing guidelines.
• [x] I have already submitted an issue or discussion thread to discuss my idea with the maintainers.

What kind of change does this PR introduce? (check at least one)

• [x] Bugfix
• [x] Feature
• [ ] Documentation
• [ ] Tutorial
• [ ] Code style update
• [x] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

If yes, please describe the impact and communicate accordingly:

The PR fulfills these requirements:

• [ ] It's submitted to the branch named as follow :
  • Fix a bug: bugfix-<some_key>-<word>
  • Improve the doc: doc-<some_key>-<word>
  • Improve a tutorial tutorial-<some_key>-<word>
  • Add a new feature: feature-<some_key>-<word>
  • Refactor some code: refactor-<some_key>-<word>
  • Optimize some code: optimize-<some_key>-<word>
• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• [ ] Don't forget to link PR to issue if you are solving one.
• [ ] All tests are passing.
• [ ] New/updated tests are included

This PR refactor the code related to the selection of ad-hoc colormaps and colorbars. It defines the configurations in YAML files, which are registered at gpm_api initialization by the pycolorbar software.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.80153% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 84.85%. Comparing base (e3eaea4) to head (e8d8e99). Report is 2 commits behind head on main.

Files	Patch %	Lines
gpm/visualization/plot.py	89.00%	11 Missing :warning:
gpm/tests/test_dataset/test_granule_files.py	78.57%	6 Missing :warning:
gpm/dataset/crs.py	88.88%	2 Missing :warning:
gpm/visualization/profile.py	33.33%	2 Missing :warning:
gpm/dataset/decoding/decode_imerg.py	98.52%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #44 +/- ## ========================================== + Coverage 81.75% 84.85% +3.10% ========================================== Files 103 107 +4 Lines 9783 10033 +250 ========================================== + Hits 7998 8514 +516 + Misses 1785 1519 -266 ```

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