Function mergePdfs

mergePdfs(files: MwFile[]): Promise<MwFile>
Function to merge multiple PDF files into a single MwFile
Parameters
- files: MwFile[]
  An array of MwFile objects
Returns Promise<MwFile>
An MwFile file object with all the PDF files merged into a single file
Example
```
const mwFiles = [file1, file2, file3];
const mergedFile = await mergePdfs(mwFiles);
```
- Defined in src/file/pdf.ts:341