Add PDF signature zone parsing functionality

This update introduces new services into the ChillDocStoreBundle for signature zone parsing within PDFs. The PDFSignatureZoneParser service identifies signature zones within PDF content while the additional classes, PDFPage and PDFSignatureZone, help define these zones and pages. Corresponding tests have also been

src/Bundle/ChillDocStoreBundle/Tests/Service/Signature/PDFSignatureZoneParserTest.php

@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Tests\Service\Signature;
+
+use Chill\DocStoreBundle\Service\Signature\PDFPage;
+use PHPUnit\Framework\TestCase;
+use Chill\DocStoreBundle\Service\Signature\PDFSignatureZone;
+use Chill\DocStoreBundle\Service\Signature\PDFSignatureZoneParser;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class PDFSignatureZoneParserTest extends TestCase
+{
+    private static PDFSignatureZoneParser $parser;
+
+    public static function setUpBeforeClass(): void
+    {
+        self::$parser = new PDFSignatureZoneParser();
+    }
+
+    /**
+     * @dataProvider provideFiles
+     *
+     * @param list<PDFSignatureZone> $expected
+     */
+    public function testFindSignatureZones(string $filePath, array $expected): void
+    {
+        $content = file_get_contents($filePath);
+
+        if (false === $content) {
+            throw new \LogicException("Unable to read file {$filePath}");
+        }
+
+        $actual = self::$parser->findSignatureZones($content);
+
+        self::assertEquals(count($expected), count($actual));
+
+        foreach ($actual as $index => $signatureZone) {
+            self::assertObjectEquals($expected[$index], $signatureZone);
+        }
+    }
+
+    public static function provideFiles(): iterable
+    {
+        yield [
+            __DIR__.'/data/signature_2_signature_page_1.pdf',
+            [
+                new PDFSignatureZone(
+                    127.7,
+                    95.289,
+                    180.0,
+                    180.0,
+                    $page = new PDFPage(0, 595.30393, 841.8897)
+                ),
+                new PDFSignatureZone(
+                    269.5,
+                    95.289,
+                    180.0,
+                    180.0,
+                    $page,
+                ),
+            ],
+        ];
+    }
+}