Rename namespace Function keyword to Functions to prevent errors

Signed-off-by: davidarendsen <davidarendsen@hey.com>

src/Function/Map.php

@@ -1,22 +0,0 @@
-<?php
-
-namespace Arendsen\FluxQueryBuilder\Function;
-
-class Map extends Base {
-
-    /**
-     * @var array $query
-     */
-    private $query;
-
-    public function __construct(string $query)
-    {
-        $this->query = $query;
-    }
-
-    public function __toString()
-    {
-        return '|> map(fn: (r) => ({ ' . $this->query . ' })) ';
-    }
-
-}