[2.x] Added inertia:check-ssr Artisan command and isHealthy() method on HttpGateway
          #752
        
          
      
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This PR addresses issues #703 and builds upon PR #751 and #673.
The Inertia SSR server has a
/healthendpoint built-in. I've added aisHealthy()method to theHttpGatewaythat performs a request against that endpoint. Then there's also aninertia:check-ssrArtisan command that's useful for deployments.