Add Kibana Status API

[stefnestor]

Kibana URI /api/status returns the JSON version of this /status UI view which is helpful to troubleshoot plugin health.

I'm only able to trace endpoint availability back to v6.5.0 when code was migrated to Kibana repo here. Originally surfaced here. Response body changed in 8.0 here & future discussed here elastic/kibana#46984.

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[pickypg]

LGTM