feat: Namespace.get_Alias ( Fixes #1138 )

Author: James Brundage

Types/Namespace/get_Alias.ps1

@@ -0,0 +1,19 @@
+<#
+.SYNOPSIS
+    Gets the aliases in the namespace.
+.DESCRIPTION
+    Gets all the aliases in the namespace.
+#>
+if (-not $this.Pattern) {
+    return
+}
+if (-not $global:AllFunctionsOrFilters) {
+    $global:AllFunctionsOrFilters = $global:ExecutionContext.SessionState.InvokeCommand.GetCommands('*','Function,Filter',$true)
+}
+foreach ($cmdPattern in $this.Pattern) {
+    foreach ($matchingCommand in $global:AllFunctionsOrFilters -match $cmdPattern) {
+        if ($matchingCommand.CommandType -eq 'Filter') {
+            $matchingCommand
+        }
+    }
+}