[codeInsight] IDEA-238740 Support the jdk.internal.PreviewFeature annotation

This patch adds support of the jdk.internal.PreviewFeature annotation

Signed-off-by: Nikita Eshkeev <nikita.eshkeev@jetbrains.com>

GitOrigin-RevId: b2f56d62c3b12475690f667628811e5345b1d1cf

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/previewfeature/PreviewFeature.java

@@ -0,0 +1,26 @@
+package jdk.internal;
+
+import java.lang.annotation.*;
+
+@Target({ElementType.METHOD,
+  ElementType.CONSTRUCTOR,
+  ElementType.FIELD,
+  ElementType.PACKAGE,
+  ElementType.TYPE})
+@Retention(RetentionPolicy.CLASS)
+public @interface PreviewFeature {
+  /**
+   * Name of the preview feature the annotated API is associated
+   * with.
+   */
+  public Feature feature();
+
+  public boolean essentialAPI() default false;
+
+  public enum Feature {
+    PATTERN_MATCHING_IN_INSTANCEOF,
+    TEXT_BLOCKS,
+    RECORDS,
+    ;
+  }
+}