Create Health Check API

[ChakshuGautam]

Create and endpoint /health with the following output. It should actually check the health of other services and update the status here.

{
   "id":"api.content.health",
   "ver":"3.0",
   "ts":"2021-06-26T22:47:05Z+05:30",
   "params":{
      "resmsgid":"859fee0c-94d6-4a0d-b786-2025d763b78a",
      "msgid":null,
      "err":null,
      "status":"successful",
      "errmsg":null
   },
   "responseCode":"OK",
   "result":{
      "checks":[
         {
            "name":"redis cache",
            "healthy":true
         },
        {
            "name":"postgres",
            "healthy":true
         },
         {
            "name":"gql service",
            "healthy":true
         },
         {
            "name":"forms service",
            "healthy":true
         },
        {
            "name":"fusionauth service",
            "healthy":true
         },
         {
            "name":"inbound service",
            "healthy":true
         },
         {
            "name":"transformer service",
            "healthy":true
         }
      ],
      "healthy":true
   }
}