feat: add color pallets

[HardeepAsrani]

Summary

This PR adds a Color Presets settings page. A palette made from these primary/secondary combo is applied to all classic chart types as default (except Geo).

Failing e2e tests are unrelated. They will be fixed separately.

Will affect visual aspect of the product

YES/NO

Screenshots

Test instructions

• Make sure new charts inherit the presets while old charts remain untoucehd.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/visualizer-pro/issues/539.

[pirate-bot]

Plugin build for 3212b38 is ready 🛎️!

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[rodica-andronache]

@HardeepAsrani it's working well. It's possible to also add the checkbox to apply it to existing charts?

[rodica-andronache]

@HardeepAsrani, when clicking on the "Clear" button, the charts should revert to their normal styling

[HardeepAsrani]

@HardeepAsrani, when clicking on the "Clear" button, the charts should revert to their normal styling

@rodica-andronache That's exactly what happens once you click on Clear and save the settings. They go back to their original.

Keep in mind that behavior only works for Apply to Existing blocks. If you created a new block, those colors are saved to the block. As at a future point in time, we have no way to know if the user picked a particular shade of red as a preset or manually.

Makes sense?

[rodica-andronache]

@HardeepAsrani ok, it makes sense. We can merge this

[pirate-bot]

🎉 This PR is included in version 4.0.0 🎉

The release is available on GitHub release

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