uri/win_uri: Make method a free text field (#49719)

* uri/win_uri: Make method a free text field

Since various interfaces introduce their own HTTP method (e.g. like
PROPFIND, LIST or TRACE) it's better to leave this up to the user.

* Fix HTTP method check in module_utils urls

* Add integration test for method UNKNOWN

* Clarify the change as requested during review

test/integration/targets/uri/tasks/main.yml

@@ -390,6 +390,20 @@
     - result is failure
     - "'failed to parse body as form_urlencoded: too many values to unpack' in result.msg"
 
+- name: Validate invalid method
+  uri:
+    url: https://{{ httpbin_host }}/anything
+    method: UNKNOWN
+  register: result
+  ignore_errors: yes
+
+- name: Assert invalid method fails
+  assert:
+    that:
+    - result is failure
+    - result.status == 405
+    - "'METHOD NOT ALLOWED' in result.msg"
+
 - name: Test client cert auth, no certs
   uri:
     url: "https://ansible.http.tests/ssl_client_verify"