Implemented undo and redo mechanism for drawing signature (#3152)

# Description of Changes

Please provide a summary of the changes, including:

Added undo and redo button for drawing signature, and provided
translation properties for the buttons

Closes
[#(2454)](https://github.com/Stirling-Tools/Stirling-PDF/issues/2454)

---

## Checklist

### General

- [✅](https://emojipedia.org/check-mark-button)I have read the
[Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [✅](https://emojipedia.org/check-mark-button) I have read the
[Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
-[✅](https://emojipedia.org/check-mark-button)I have read the [How to
add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [✅](https://emojipedia.org/check-mark-button) I have performed a
self-review of my own code
-[✅](https://emojipedia.org/check-mark-button) My changes generate no
new warnings


### UI Changes (if applicable)
![Screenshot 2025-03-10
142354](https://github.com/user-attachments/assets/4f36553f-4f8a-4cd3-854f-3acc2056f91e)


### Testing (if applicable)

- [✅](https://emojipedia.org/check-mark-button) I have tested my changes
locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

src/main/resources/templates/sign.html

@@ -56,6 +56,10 @@
                   th:text="#{sign.clear}"></button>
                 <button id="save-signature" class="btn btn-outline-success mt-2" onclick="addDraggableFromPad()"
                   th:text="#{sign.add}"></button>
+                  <button id="signature-undo-button" class="btn btn-outline-secondary mt-2" th:text="#{sign.undo}"
+                  onclick="undoDraw()"></button>
+                <button id="signature-redo-button" class="btn btn-outline-secondary mt-2" th:text="#{sign.redo}"
+                  onclick="redoDraw()"></button>
               </div>
 
               <div class="tab-container" th:title="#{sign.saved}" th:data-title="#{sign.saved}">