add azure_rm_appserviceplan module (#40906)

* add azure_rm_appserviceplan module

* fix lint in test

* fix lint

* fix test

* fix test syntax

* resolve comments

* fix test

test/integration/targets/azure_rm_appserviceplan/aliases

@@ -0,0 +1,3 @@
+cloud/azure
+shippable/azure/group4
+destructive

test/integration/targets/azure_rm_appserviceplan/meta/main.yml

@@ -0,0 +1,2 @@
+dependencies:
+  - setup_azure

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

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+- name: Prepare facts
+  set_fact:
+    linux_plan_resource_group: "{{ resource_group_secondary }}"
+    win_plan_name: "{{ (resource_prefix | replace('-','x'))[-8:] }}winplan"
+    linux_plan_name: "{{ (resource_group_secondary | replace('-','x'))[-8:] }}linplan"
+
+- name: create a windows plan
+  azure_rm_appserviceplan:
+    name: "{{ win_plan_name }}1"
+    resource_group: "{{ resource_group }}"
+    sku: B1
+  register: output
+
+- name: assert app service was created
+  assert:
+    that: 
+      - output.changed
+      - output.id
+
+- name: create a linux plan
+  azure_rm_appserviceplan:
+    resource_group: "{{ linux_plan_resource_group }}"
+    name: "{{ linux_plan_name }}1"
+    sku: S1
+    is_linux: true
+    number_of_workers: 1
+  register: output
+
+- name: assert app service was created
+  assert:
+    that: 
+      - output.changed
+      - output.id
+
+- name: create linux app service plan idempotent
+  azure_rm_appserviceplan:
+    resource_group: "{{ linux_plan_resource_group }}"
+    name: "{{ linux_plan_name }}1"
+    sku: S1
+    is_linux: true
+    number_of_workers: 1
+  register: output
+
+- name: assert app service was created
+  assert:
+    that: not output.changed
+
+- name: update a windows plan sku
+  azure_rm_appserviceplan:
+    name: "{{ win_plan_name }}1"
+    resource_group: "{{ resource_group }}"
+    sku: B2
+  register: output
+
+- name: assert app service was updated
+  assert:
+    that:
+      - output.changed
+
+- name: update a linux plan number of workers
+  azure_rm_appserviceplan:
+    resource_group: "{{ linux_plan_resource_group }}"
+    name: "{{ linux_plan_name }}1"
+    sku: S1
+    is_linux: true
+    number_of_workers: 2
+  register: output
+
+- name: assert app service was updated
+  assert:
+    that:
+      - output.changed