Register the javac end-position API for the native image

Since palantir#1786, Trees reaches
JCTree.getEndPosition(EndPosTable) and JCCompilationUnit.endPositions
through method handles, so that the same code runs on JDK 27, where
neither exists. The image is built with --exact-reachability-metadata, so
without these entries every file failed, even `class A{int x;}`:
"Cannot reflectively access method 'com.sun.tools.javac.tree.JCTree#getEndPosition(com.sun.tools.javac.tree.EndPosTable)'".

Author: abashev

open-java-format-native/src/main/resources/META-INF/native-image/reachability-metadata.json

@@ -160,6 +160,28 @@
         }
       ]
     },
+    {
+      "type": "com.sun.tools.javac.tree.EndPosTable"
+    },
+    {
+      "type": "com.sun.tools.javac.tree.JCTree",
+      "methods": [
+        {
+          "name": "getEndPosition",
+          "parameterTypes": [
+            "com.sun.tools.javac.tree.EndPosTable"
+          ]
+        }
+      ]
+    },
+    {
+      "type": "com.sun.tools.javac.tree.JCTree$JCCompilationUnit",
+      "fields": [
+        {
+          "name": "endPositions"
+        }
+      ]
+    },
     {
       "type": "java.io.Serializable"
     },