Add ios_user implementation module (#25413)

* Add ios_user module

Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>

* Integration test for ios_user

Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>

* Add unit test for ios_user

Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>

test/integration/targets/ios_user/tests/cli/basic.yaml

@@ -0,0 +1,43 @@
+---
+- name: Create user
+  ios_user:
+    name: netend
+    privilege: 15
+    role: network-operator
+    state: present
+    authorize: yes
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - 'result.commands == ["username netend view network-operator", "username netend privilege 15"]'
+
+- name: Collection of users
+  ios_user:
+    users:
+      - name: test1
+      - name: test2
+    authorize: yes
+    state: present
+    view: network-admin
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - 'result.commands == ["username test1 view network-admin", "username test2 view network-admin"]'
+
+- name: tearDown
+  ios_user:
+    purge: yes
+    authorize: yes
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - 'result.commands == ["no username netend", "no username test1", "no username test2"]'