implement startup readiness health checks

[axgiri]

Checklist:

• Tested
  [FR]: Core - API - Organize readiness healthchecks #1282

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[GregJohnStewart]

Let's also organize the health utilities a little;

.../api/health/
    /service/
        *HealthCheck.java //actual health checks
        /utils/
            Has*Check.java //resources for facilitating health checks