Feat: Readonly state for uui-color-swatches

[bjarnef]

Description

This PR adds a readonly state for the uui-color-swatches component. It will ensure that each swatch can't be selected.
Fixes #901

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

Motivation and context

How to test?

Screenshots (if appropriate)

Checklist

• If my change requires a change to the documentation, I have updated the documentation in this pull request.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[github-actions]

Hi there @bjarnef, thank you for this contribution! 👍

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• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
• The level of security for this contribution is the same or improved
• The level of performance for this contribution is the same or improved
• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[umbrabot]

Hi there @bjarnef!

First of all: A big #H5YR for making an Umbraco related contribution during Hacktoberfest! We are very thankful for the huge amount of PRs submitted, and all the amazing work you've been doing 🥇

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