Added function to convert camelCase to snake_case for powershell (#26203)

* Added camel case to snake case converters

* removed uneeded shebang

* renamed util to remove PowerShell from the name

test/integration/targets/win_module_utils/library/camel_conversion_test.ps1

@@ -0,0 +1,64 @@
+#!powershell
+
+#Requires -Module Ansible.ModuleUtils.PowerShellLegacy
+#Requires -Module Ansible.ModuleUtils.CamelConversion
+
+$ErrorActionPreference = 'Continue'
+
+Function Assert-Equals($actual, $expected) {
+    if ($actual -cne $expected) {
+        Fail-Json @{} "actual != expected`nActual: $actual`nExpected: $expected"
+    }
+}
+
+$input_dict = @{
+    alllower = 'alllower'
+    ALLUPPER = 'allupper'
+    camelCase = 'camel_case'
+    mixedCase_withCamel = 'mixed_case_with_camel'
+    TwoWords = 'two_words'
+    AllUpperAtEND = 'all_upper_at_end'
+    AllUpperButPLURALs = 'all_upper_but_plurals'
+    TargetGroupARNs = 'target_group_arns'
+    HTTPEndpoints = 'http_endpoints'
+    PLURALs = 'plurals'
+    listDict = @(
+        @{ entry1 = 'entry1'; entryTwo = 'entry_two' },
+        'stringTwo',
+        0
+    )
+    INNERHashTable = @{
+        ID = 'id'
+        IEnumerable = 'i_enumerable'
+    }
+}
+
+$output_dict = Convert-DictToSnakeCase -dict $input_dict
+foreach ($entry in $output_dict.GetEnumerator()) {
+    $key = $entry.Name
+    $value = $entry.Value
+
+    if ($value -is [Hashtable]) {
+        Assert-Equals -actual $key -expected "inner_hash_table"
+        foreach ($inner_hash in $value.GetEnumerator()) {
+            Assert-Equals -actual $inner_hash.Name -expected $inner_hash.Value
+        }
+    } elseif ($value -is [Array]) {
+        # there is one array in our original dict, we know the structure
+        foreach ($inner_list in $value) {
+            if ($inner_list -is [Hashtable]) {
+                foreach ($inner_list_hash in $inner_list.GetEnumerator()) {
+                    Assert-Equals -actual $inner_list_hash.Name -expected $inner_list_hash.Value
+                }
+            } elseif ($inner_list -is [String]) {
+                Assert-Equals -actual $inner_list -expected "string_two"
+            } else {
+                Assert-Equals -actual $inner_list -expected 0
+            }
+        }
+    } else {
+        Assert-Equals -actual $key -expected $value
+    }
+}
+
+Exit-Json @{ data = 'success' }

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

@@ -31,3 +31,11 @@
     that:
     - bogus_utils | failed
     - bogus_utils.msg | search("Could not find")
+
+- name: call module with camel conversion tests
+  camel_conversion_test:
+  register: camel_conversion
+
+- assert:
+    that:
+    - camel_conversion.data == 'success'