Feature: Split PDFs by Chapters/Bookmarks (#1786)

* feature:split pdf by chapters

* Update SplitPdfByChaptersController.java

* Update SplitPdfByChaptersController.java

* Update SplitPdfByChaptersController.java

src/main/java/stirling/software/SPDF/model/api/SplitPdfByChaptersRequest.java

@@ -0,0 +1,21 @@
+package stirling.software.SPDF.model.api;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@EqualsAndHashCode(callSuper = false)
+public class SplitPdfByChaptersRequest extends PDFFile {
+    @Schema(description = "Whether to include Metadata or not", example = "true")
+    private Boolean includeMetadata;
+
+    @Schema(description = "Whether to allow duplicates or not", example = "true")
+    private Boolean allowDuplicates;
+
+    @Schema(description = "Maximum bookmark level required", example = "2")
+    private Integer bookmarkLevel;
+}