feat: add multi select component

[petermakowski]

Done

This adds a multi select component and introduces an internal FadeInDown component for handling fade in transitions. This is experimental and should be used internally only for now.

• feat: add multi select component

This component matches image provisioning design (with the exception of adding the search input field for filtering of options)

QA steps

• Go to the example page ?path=/story/components-multiselect--example
• Ensure the component is displayed correctly across all breakpoints
• Click on a label
• Make sure the list box has been opened
• Make sure you can select and remove items
• Go to NestedFormGroup and ensure it expands and collapses as before
• Make sure component matches image provisioning design (with the exception of adding the search input field for filtering of options)

Fixes

Fixes: MAASENG-2534

Screenshots

Notes

[ndv99]

This is really cool, LGTM!

[github-actions]

🎉 This PR is included in version 1.16.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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