feat: Namespace.get_Function ( Fixes #1140 )

Author: James Brundage

Types/Namespace/get_Function.ps1

@@ -0,0 +1,7 @@
+if (-not $this.Pattern) { return }
+if (-not $global:AllFunctionsOrFilters) {
+    $global:AllFunctionsOrFilters = $global:ExecutionContext.SessionState.InvokeCommand.GetCommands('*','Function,Filter',$true)
+}
+foreach ($cmdPattern in $this.Pattern) {
+    $global:AllFunctionsOrFilters -match $cmdPattern
+}