Add PHP Analyzer Plugin and Composer Lock Data Handling

- Implemented the PhpAnalyzerPlugin to analyze PHP projects.
- Created ComposerLockData class to represent data from composer.lock files.
- Developed ComposerLockReader to load and parse composer.lock files asynchronously.
- Introduced ComposerPackage class to encapsulate package details.
- Added PhpPackage class to represent PHP packages with metadata and evidence.
- Implemented PhpPackageCollector to gather packages from ComposerLockData.
- Created PhpLanguageAnalyzer to perform analysis and emit results.
- Added capability signals for known PHP frameworks and CMS.
- Developed unit tests for the PHP language analyzer and its components.
- Included sample composer.lock and expected output for testing.
- Updated project files for the new PHP analyzer library and tests.

src/Zastava/StellaOps.Zastava.Webhook/Admission/AdmissionResponseBuilder.cs

@@ -68,6 +68,11 @@ internal sealed class AdmissionResponseBuilder
                 metadata["cache"] = "hit";
             }
 
+            if (!string.IsNullOrWhiteSpace(decision.SurfacePointer))
+            {
+                metadata["surfacePointer"] = decision.SurfacePointer!;
+            }
+
             var resolved = decision.ResolvedDigest ?? decision.OriginalImage;
 
             images.Add(new AdmissionImageVerdict