Add support for windows-style path (backslashes) (#11073)

# What Does This Do
Source filename used in probe definition can have path using backslashes
(Windows-style)
we normalize those paths before building the definition matcher

# Motivation

# Additional Notes

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documentation](https://docs.datadoghq.com/tracing/trace_collection/library_config/java/)
with any new configuration flags or behaviors

Jira ticket: [DEBUG-5109]

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[DEBUG-5109]:
https://datadoghq.atlassian.net/browse/DEBUG-5109?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: jpbempel

dd-java-agent/agent-debugger/src/main/java/com/datadog/debugger/agent/TransformerDefinitionMatcher.java

@@ -59,6 +59,7 @@ private void populateDefinitionFileNamesMap(Collection<ProbeDefinition> definiti
       if (fileName == null) {
         continue;
       }
+      fileName = normalizeWindowsToUnixPath(fileName);
       Map<String, List<ProbeDefinition>> targetMap =
           fileName.indexOf('/') != -1
               ? definitionsByQualifiedFileNames
@@ -67,6 +68,10 @@ private void populateDefinitionFileNamesMap(Collection<ProbeDefinition> definiti
     }
   }
 
+  private static String normalizeWindowsToUnixPath(String fileName) {
+    return fileName.replace('\\', '/');
+  }
+
   private Trie buildDefinitionFileNamesTrie(
       Map<String, List<ProbeDefinition>> definitionsByFileNames) {
     Trie resultTrie = new Trie();

dd-java-agent/agent-debugger/src/test/java/com/datadog/debugger/agent/TransformerDefinitionMatcherTest.java

@@ -74,6 +74,26 @@ public void sourceFileAbsoluteFileName() {
     assertEquals(PROBE_ID1, probeDefinitions.get(0).getProbeId());
   }
 
+  @Test
+  public void sourceFileWindowsStyleFileName() {
+    LogProbe probe = createProbe(PROBE_ID1, "src\\main\\java\\java\\lang\\String.java", 23);
+    TransformerDefinitionMatcher matcher = createMatcher(probe);
+    List<ProbeDefinition> probeDefinitions = match(matcher, String.class);
+    assertEquals(1, probeDefinitions.size());
+    assertEquals(PROBE_ID1, probeDefinitions.get(0).getProbeId());
+  }
+
+  @Test
+  public void sourceFileWindowsStyleAbsoluteFileName() {
+    LogProbe probe =
+        createProbe(
+            PROBE_ID1, "C:\\Users\\user\\project\\src\\main\\java\\java\\lang\\String.java", 23);
+    TransformerDefinitionMatcher matcher = createMatcher(probe);
+    List<ProbeDefinition> probeDefinitions = match(matcher, String.class);
+    assertEquals(1, probeDefinitions.size());
+    assertEquals(PROBE_ID1, probeDefinitions.get(0).getProbeId());
+  }
+
   @Test
   public void sourceFileSimpleFileName() {
     LogProbe probe = createProbe(PROBE_ID1, "String.java", 23);