Rename namespace Function keyword to Functions to prevent errors

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

tests/Functions/FilterFunctionTest.php

@@ -2,7 +2,7 @@
 declare(strict_types=1);
 
 use Arendsen\FluxQueryBuilder\Expression\KeyValue;
-use Arendsen\FluxQueryBuilder\Function\Filter;
+use Arendsen\FluxQueryBuilder\Functions\Filter;
 use PHPUnit\Framework\TestCase;
 
 final class FilterFunctionTest extends TestCase {

tests/Functions/FromFunctionTest.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-use Arendsen\FluxQueryBuilder\Function\From;
+use Arendsen\FluxQueryBuilder\Functions\From;
 use PHPUnit\Framework\TestCase;
 
 final class FromFunctionTest extends TestCase {

tests/Functions/GroupFunctionTest.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-use Arendsen\FluxQueryBuilder\Function\Group;
+use Arendsen\FluxQueryBuilder\Functions\Group;
 use PHPUnit\Framework\TestCase;
 
 final class GroupFunctionTest extends TestCase {

tests/Functions/LimitFunctionTest.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-use Arendsen\FluxQueryBuilder\Function\Limit;
+use Arendsen\FluxQueryBuilder\Functions\Limit;
 use PHPUnit\Framework\TestCase;
 
 final class LimitFunctionTest extends TestCase {

tests/Functions/MapFunctionTest.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-use Arendsen\FluxQueryBuilder\Function\Map;
+use Arendsen\FluxQueryBuilder\Functions\Map;
 use PHPUnit\Framework\TestCase;
 
 final class MapFunctionTest extends TestCase {

tests/Functions/ReduceFunctionTest.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-use Arendsen\FluxQueryBuilder\Function\Reduce;
+use Arendsen\FluxQueryBuilder\Functions\Reduce;
 use PHPUnit\Framework\TestCase;
 
 final class ReduceFunctionTest extends TestCase {

tests/Functions/SortFunctionTest.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-use Arendsen\FluxQueryBuilder\Function\Sort;
+use Arendsen\FluxQueryBuilder\Functions\Sort;
 use PHPUnit\Framework\TestCase;
 
 final class SortFunctionTest extends TestCase {