Simplify extending the ErrorDataSetRenderer

[TheBoegl]

This commit changes the access modifier for the CachedDataPoints class to public and fixes #613. It also makes it easier to customize the error data set renderer and avoids split packages.

[pr-explainer-bot[bot]]

Pull Request Report

Greetings! 👋

Here's a report summarizing the changes, suggestions, bugs, improvements, and rating for the pull request.

Changes

1. Changed the access modifier for the CachedDataPoints class from package private to public. (Link to file)

Suggestions

No suggestions provided.

Bugs

No bugs found.

Improvements

No improvements suggested.

Rating

Overall rating: 8/10

Criteria:

• Readability: 8/10
• Performance: 9/10
• Security: 7/10

That's it for the report! Let me know if you need any further assistance. 😄

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% :tada:

Comparison is base (3846311) 47.90% compared to head (10c5ffd) 47.91%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #615 +/- ## ============================================ + Coverage 47.90% 47.91% +0.01% - Complexity 6181 6183 +2 ============================================ Files 401 401 Lines 38254 38254 Branches 6087 6087 ============================================ + Hits 18326 18331 +5 Misses 18778 18778 + Partials 1150 1145 -5 ``` | [Files Changed](https://app.codecov.io/gh/fair-acc/chart-fx/pull/615?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fair-acc) | Coverage Δ | | |---|---|---| | [...air\_acc/chartfx/renderer/spi/CachedDataPoints.java](https://app.codecov.io/gh/fair-acc/chart-fx/pull/615?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fair-acc#diff-Y2hhcnRmeC1jaGFydC9zcmMvbWFpbi9qYXZhL2lvL2ZhaXJfYWNjL2NoYXJ0ZngvcmVuZGVyZXIvc3BpL0NhY2hlZERhdGFQb2ludHMuamF2YQ==) | `38.98% <100.00%> (ø)` | | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/fair-acc/chart-fx/pull/615/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fair-acc)

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