Button v2 dropdown enhancement

[PavelJankoski]

Summary

Changes in button v2 and new dropdown v2 component.

Changes

Added the dropdown, boilerplate, code logic into the component itself. Also created dropdown v2 with minor modifications from the previous dropdown to match the style of the new design.

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• The steps/process to test this feature are clearly explained including testing for regressions.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[kschiffer]

Please always add screenshots to PRs with visual changes.

[ryaplots]

Thanks!