Add a HealthCheck Enricher for Webapps

[jstrachan]

we should generate a readiness & liveness checks OOTB for war packaging apps.

If there is a service annotation for api.service.kubernetes.io/path we could use that if no explicit happy page URL is configured in the pom.xml; otherwise we could just default to using /

[stale]

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[rhuss]

the health check enricher should work in the same spirit as the enrichers we have now for Vertx, Prometheus etc.

Alternatively, the webapp generator could also add just a Docker HEALTHCHECK we already can be reused by the DockerHealthCheckEnricher