feat: chunk uploads (#76)

* add first concept

* finished first concept

* allow 3 uploads at same time

* retry if chunk failed

* updated clean temporary files job

* fix throttling for chunk uploads

* update tests

* remove multer

* migrate from `MAX_FILE_SIZE` to `MAX_SHARE_SIZE`

* improve error handling if file failed to upload

* fix promise limit

* improve file progress

frontend/src/components/upload/modals/showCompletedUploadModal.tsx

@@ -37,6 +37,7 @@ const Body = ({ share }: { share: Share }) => {
   return (
     <Stack align="stretch">
       <TextInput
+        readOnly
         variant="filled"
         value={link}
         rightSection={