- Started working on decoupling QueryBuilder from SqlQueryBuilder

- WIP on SearchRequest attributes
- Began working on removing 'Ulmus' class
- WIP on removing SQL query building from Repository (which will become SqlRepository)

src/QueryBuilder/QueryBuilderInterface.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Ulmus\QueryBuilder;
+
+use Ulmus\Query\QueryFragmentInterface;
+
+interface QueryBuilderInterface
+{
+    public function push(QueryFragmentInterface $queryFragment) : self;
+    public function pull(QueryFragmentInterface $queryFragment) : self;
+    public function render(bool $skipToken = false) /* mixed */;
+    public function reset() : void;
+    public function getFragment(string $class, int $index = 0) : ? QueryFragmentInterface;
+    public function removeFragment(QueryFragmentInterface|array|\Stringable|string $fragment) : void;
+}