Restructured authmiddleware fn and added tests (#2410)

* Created separate file for authmiddleware fn
* Optimize auth login and middleware
* Added unittests for authmiddleware
* Fixed authURL
* Removed featureConfig as global variable
* Fix integration test according to examples repo changes
* Fix integration test path for go module-example

Co-authored-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/featureconfig/config.go

@@ -45,5 +45,9 @@ func GetFeatureConfig() (*FeatureConfig, error) {
 		return nil, fmt.Errorf("error unmarshalling YAML config %v", err)
 	}
 
+	if featureConfig.AuthConfig.AuthUriPath == "" {
+		featureConfig.AuthConfig.AuthUriPath = "/auth/login"
+	}
+
 	return featureConfig, err
 }