[Metrics UI] Allow users to configure Inventory View palettes

[simianhacker]

Summary

This PR closes #65913 by enhancing the legend configuration options to include the color palette settings. This also changes how the min/max work by using auto-correction to ensure the user doesn't make mistakes.

Testing Checklist

• Ensure you can save color palettes with views
• Ensure you can restore views with custom palettes
• Change the bounds to a smaller range then the data. Ensure nodes above the maxium are colored with the max color and the nodes below the minimum are colored with the min color.
• Change the steps to 2, ensure there are only 2 colors used on the map.
• Try to create a minimum above the maximum, ensure it autocorrects to one less than the max.
• Try to create a maximum below the minimum, ensure it autocorrects to one more then the minimum.

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• This was checked for keyboard-only and screenreader accessibility
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser
• This was checked for cross-browser compatibility, including a check against IE11

[elasticmachine]

Pinging @elastic/logs-metrics-ui (Team:logs-metrics-ui)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: f722043

History

• 💔 Build #49029 failed 7f4013a
• 💚 Build #48944 succeeded 8776bd7
• 💔 Build #48881 failed 1ec74fe
• 💔 Build #48809 failed b3d4ef0

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[phillipb]

LGTM!