Create a EuiBadgeGroup component

[cchaos]

Badges are kind of complicated when you start laying them out in flex groups because of truncation issues. I had to do a lot of custom styles in Kibana to get the global filter pills to wrap and truncate properly. Now we're having the same issue in Kibana Graph (elastic/kibana#57859).

We should just create EuiBadgeGroup that will handle the proper layout of multiple badges.

[cchaos]

Part of the custom code in Kibana:

https://github.com/elastic/kibana/blob/0340fac14967d1e9b072517c4c09d64476b67d89/src/plugins/data/public/ui/filter_bar/_global_filter_item.scss#L1-L15

The component should probably allow altering similar properties to EuiFlexGroup like:

• gutterSize
• wrap

[anishagg17]

@cchaos I want to work on this issue