feat: add donut chart legend

[abdelkd]

Description
This PR adds a feature from #876 for an optional legend to donut chart that's hidden by default, providing null to activeSector prop would show the legend with no default value and providing an index string from data would make the element active on page load

I added a new activeSector prop that receives undefined or null or string and it will make sector active upon page loading up and

Related issue(s)

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

• Bug fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• New Feature (BREAKING CHANGE which adds functionality)
• Refactor
• Build-related changes
• Other, please describe:

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

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

How has this been tested?

Screenshots (if appropriate):

The PR fulfils these requirements:

• It's submitted to the main branch
• When resolving a specific issue, it's referenced in the related issue section above
• My change requires a change to the documentation. (Managed by Tremor Team)
• I have added tests to cover my changes
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