Add cucumber test for header modifier filter

test/cucumber-tests/src/test/resources/artifacts/apk-confs/request_and_response_filters.apk-conf

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+---
+id: "api-with-request-and-response-filters"
+name: "EmployeeServiceAPI"
+basePath: "/request-and-response-filters"
+version: "3.14"
+type: "REST"
+defaultVersion: false
+endpointConfigurations:
+  production:
+    endpoint: "http://backend:80/anything"
+operations:
+  - target: "/employee"
+    verb: "GET"
+    secured: false
+    scopes: []
+    operationPolicies:
+      request:
+        - policyName: AddHeaders
+          policyVersion: v1
+          parameters:
+            headers:
+              - name: "Test-Request-Header"
+                value: "Test-Value"
+        - policyName: SetHeaders
+          policyVersion: v1
+          parameters:
+            headers:
+              - name: "Set-Request-Header"
+                value: "Test-Value"
+        - policyName: RemoveHeaders
+          policyVersion: v1
+          parameters:
+            headers:
+              - "Authorization"
+      response:
+        - policyName: AddHeaders
+          policyVersion: v1
+          parameters:
+            headers:
+              - name: "Test-Response-Header"
+                value: "Test-Value"
+        - policyName: SetHeaders
+          policyVersion: v1
+          parameters:
+            headers:
+              - name: "Set-Response-Header"
+                value: "Test-Value"
+        - policyName: RemoveHeaders
+          policyVersion: v1
+          parameters:
+            headers:
+              - "content-type"
+  - target: "/employee"
+    verb: "POST"
+    secured: true
+    scopes: []
+  - target: "/employee/{employeeId}"
+    verb: "PUT"
+    secured: true
+    scopes: []
+  - target: "/employee/{employeeId}"
+    verb: "DELETE"
+    secured: true
+    scopes: []

test/cucumber-tests/src/test/resources/tests/api/HTTPRouteFilters.feature

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+Feature: Test HTTPRoute Filter Header Modifier functionality
+    Scenario: Test request and response header modification functionality
+        Given The system is ready
+        And I have a valid subscription
+        When I use the APK Conf file "artifacts/apk-confs/request_and_response_filters.apk-conf"
+        And the definition file "artifacts/definitions/employees_api.json"
+        And make the API deployment request
+        Then the response status code should be 200
+        Then I set headers
+            | Authorization             | bearer ${accessToken} |
+        And I send "GET" request to "https://default.gw.wso2.com:9095/request-and-response-filters/3.14/employee/" with body ""
+        And I eventually receive 200 response code, not accepting
+            | 401 |
+        And the response body should contain "\"Test-Request-Header\": \"Test-Value\""
+        And the response body should contain "\"Set-Request-Header\": \"Test-Value\""
+        And the response body should not contain "\"Authorization\""
+        Then the response headers contains key "Set-Response-Header" and value "Test-Value"
+        Then the response headers contains key "Test-Response-Header" and value "Test-Value"
+        And the response headers should not contain
+        | content-type |
+
+    Scenario: Undeploy the API
+        Given The system is ready
+        And I have a valid subscription
+        When I undeploy the API whose ID is "api-with-request-and-response-filters"
+        Then the response status code should be 202
+
+