Add document splitting functionality to the multi-tools page (#1808)

* Add a split button on top of the insert button in multitool viewer.

* Add placeholder splitFileButtonCallback method.

* Remove unused splitFileButtonContainer element.

* Add this binding to setActions for splitFileButtonCallback

* Add test log for adding separators.

* Add test log for adding separators.

* Remove test logs and add visual indicators to separators instead.

* Add splitting functionality to multi-tools.

* Prevent trying to split from index 0.

* Hide the split button for the first page to avoid confusion.

* Change the class name 'cutBefore' to 'split-before' to fall mroe in line with already existing classes.

* Add dummy methods for splitting and compressing documents.

* Remove form submission, begin work on client side splitting.

* Add client side document splitting.

* Add client side archiving for the split documents.

* Fix a bug that adds an empty page to splitted documents due to a sorting error.

* Add a 'Split All' button and the relevant functionality.

---------

Co-authored-by: kazandaki <ahmetfiratusta@gmail.com>
Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>

src/main/resources/static/css/pdfActions.css

@@ -116,4 +116,13 @@ html[dir="rtl"] .pdf-actions_container:last-child>.pdf-actions_insert-file-butto
   translate: 50% -50%;
   aspect-ratio: 1;
   border-radius: 100px;
-}
+}
+
+.pdf-actions_split-file-button {
+  position: absolute;
+  top: 25%;
+  right: 50%;
+  translate: 0 -50%;
+  aspect-ratio: 1;
+  border-radius: 100px;
+}