Load pdf libs when needed (#1902)

* feat: only load pdf-lib when its used

* feat: only load pdfjs when its used

src/main/resources/templates/convert/pdf-to-csv.html

@@ -33,6 +33,7 @@
                 </div>
                 <canvas id="overlayCanvas" style="position: absolute; top: 0; left: 0; z-index: 2;"></canvas>
               </div>
+              <script type="module" th:src="@{'/pdfjs-legacy/pdf.mjs'}"></script>
               <script>
                 let pdfCanvas  = document.getElementById('crop-pdf-canvas');
                 let overlayCanvas = document.getElementById('overlayCanvas');

src/main/resources/templates/convert/pdf-to-pdfa.html

@@ -30,6 +30,7 @@
                 <div id="result" class="alert-warning"></div>
                 <button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{pdfToPDFA.submit}"></button>
               </form>
+              <script type="module" th:src="@{'/pdfjs-legacy/pdf.mjs'}"></script>
               <script th:inline="javascript">
                 document.getElementById('fileInput-input').addEventListener('change', async () => {
                   pdfjsLib.GlobalWorkerOptions.workerSrc = './pdfjs-legacy/pdf.worker.mjs';
@@ -41,7 +42,7 @@
 
                   try {
                     const pdf = await pdfjsLib.getDocument({ data: arrayBuffer }).promise;
-                    
+
                     let hasSignature = false;
 
                     for (let i = 1; i <= pdf.numPages; i++) {