Implemented uploading xml files on expense import page

[Civolilah]

@beganovich @turbo124 The PR includes the implementation of XML file uploading for expenses. The functionality includes accepting only .xml files along with CHECKING the length of lines that the file is made of. If the file has only one line, we will display a message in the toaster from the xml_lines_length keyword (we are missing this keyword from the files, if you agree, please just add it there). The payload is constructed from the import_type: expense and files as binary type. There is also functionality for REMOVING files after they are uploaded. For the final import of files I used /api/v1/edocument/upload POST route. Screenshots:

Note: We miss "xml_file" translation keyword, if you would agree, please just add it into files.

Closes: #1904

Let me know your thoughts.

[turbo124]

@Civolilah

I think this is missing some addtional props

_method: PUT
documents[]: (binary)

[turbo124]

@Civolilah I've updated the functionality here and have this working now. Can we just please ensure that on a successful upload, we clear the documents from the dropzone :)

[Civolilah]

@Civolilah I've updated the functionality here and have this working now. Can we just please ensure that on a successful upload, we clear the documents from the dropzone :)

@turbo124 It should be adjusted just as you explained. Please let me know your thoughts.