Add qualifier functions; bump to PHP 8.5

tests/Unit/FieldTest.php

@@ -192,6 +192,21 @@ describe('->toWhere()', function () {
     })->group('sqlite');
 });
 
+describe('->andQualifier()', function() {
+    test('adds a qualifier', function () {
+        expect(Field::equal('that', '82')->andQualifier('this'))->qualifier->toBe('this');
+    });
+});
+
+describe('::withQualifier()', function() {
+    test('adds a qualifier to a new instance', function () {
+        $field = Field::equal('that', '14');
+        $field2 = Field::withQualifier('this')($field);
+        expect($field)->qualifier->toBe('')
+            ->and($field2)->qualifier->toBe('this');
+    });
+});
+
 describe('::equal()', function () {
     test('creates Field w/o parameter', function () {
         $field = Field::equal('my_test', 9);