Add powershell echo test, rename api key names (#17043)

* add powershell echo test, rename api key names

* update

samples/client/echo_api/powershell/Build.ps1

@@ -0,0 +1,73 @@
+#
+# Echo Server API
+# Echo Server API
+# Version: 0.1.0
+# Contact: team@openapitools.org
+# Generated by OpenAPI Generator: https://openapi-generator.tech
+#
+
+function Get-FunctionsToExport {
+    [CmdletBinding()]
+    Param (
+        [Parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true)]
+        [ValidateNotNullOrEmpty()]
+        [Alias('FullName')]
+        $Path
+    )
+
+    Process {
+        $Token = $null
+        $ParserErr = $null
+
+        $Ast = [System.Management.Automation.Language.Parser]::ParseFile(
+            $Path,
+            [ref]$Token,
+            [ref]$ParserErr
+        )
+
+        if ($ParserErr) {
+            throw $ParserErr
+        } else {
+            foreach ($name in 'Begin', 'Process', 'End') {
+                foreach ($Statement in $Ast."${name}Block".Statements) {
+                    if (
+                        [String]::IsNullOrWhiteSpace($Statement.Name) -or
+                        $Statement.Extent.ToString() -notmatch
+                        ('function\W+{0}' -f $Statement.Name)
+                    ) {
+                        continue
+                    }
+
+                    $Statement.Name
+                }
+            }
+        }
+    }
+}
+
+$ScriptDir = Split-Path $script:MyInvocation.MyCommand.Path
+$FunctionPath = 'Api', 'Model', 'Client' | ForEach-Object {Join-Path "$ScriptDir\src\PSOpenAPITools\" $_}
+
+$Manifest = @{
+    Path = "$ScriptDir\src\PSOpenAPITools\PSOpenAPITools.psd1"
+
+    Author = 'OpenAPI Generator Team'
+    CompanyName = 'openapitools.org'
+    Description = 'PSOpenAPITools - the PowerShell module for Echo Server API'
+
+    ModuleVersion = '0.1.2'
+
+    RootModule = 'PSOpenAPITools.psm1'
+    Guid = 'a27b908d-2a20-467f-bc32-af6f3a654ac5' # Has to be static, otherwise each new build will be considered different module
+
+    PowerShellVersion = '6.2'
+
+    FunctionsToExport = $FunctionPath | Get-ChildItem -Filter *.ps1 | Get-FunctionsToExport
+
+    VariablesToExport = @()
+    AliasesToExport = @()
+    CmdletsToExport = @()
+
+}
+
+New-ModuleManifest @Manifest