[infra-proxy-service] chef infra node detail API (#4471)

Author: Vivek Singh

api/external/infra_proxy/infra_proxy.pb.go

@@ -233,6 +233,11 @@ service InfraProxy {
     option (chef.automate.api.iam.policy).resource = "infra:infraServers:{server_id}:orgs:{org_id}:nodes";
     option (chef.automate.api.iam.policy).action = "infra:infraServers:update";
   };
+  rpc GetNode (infra_proxy.request.Node) returns (infra_proxy.response.Node) {
+    option (google.api.http).get = "/api/v0/infra/servers/{server_id}/orgs/{org_id}/nodes/{name}";
+    option (chef.automate.api.iam.policy).resource = "infra:infraServers:{server_id}:orgs:{org_id}:nodes";
+    option (chef.automate.api.iam.policy).action = "infra:infraServers:get";
+  };
 
   rpc GetPolicyfiles (infra_proxy.request.Policyfiles) returns (infra_proxy.response.Policyfiles) {
     option (google.api.http).get = "/api/v0/infra/servers/{server_id}/orgs/{org_id}/policyfiles";