Add a display limit to EUIBadgeGroup

[JasonStoltz]

This request was initiated by a question asked by @TattdCodeMonkey.

The idea would be to add some sort of "length" or "limit" property to EUIBadgeGroup.

Example:

<EuiBadgeGroup length={3} items={badges} color="primary" />

Looking across Kibana, there are many instances of this being implemented manually.

Examples:
https://github.com/elastic/kibana/blob/main/x-pack/plugins/uptime/public/legacy_uptime/components/common/monitor_tags.tsx
https://github.com/elastic/kibana/blob/main/x-pack/plugins/synthetics/public/apps/[…]components/monitors_page/management/monitor_list_table/tags.tsx

There are more than that, but those are the couple I found in a quick search.