One by one file adding support in mutiple `BitFileUpload`

[RezaKargar]

Describe the bug I think the BitFileUpload component with multiple file support should make user to be able to select files one by one.

To Reproduce In multiple BitFileUpload:

1. Select one file, wait till finish of it's upload process
2. Select another file, it clearly uploads the file but there is no sign of first file that we uploaded

Step 1	Step 2
After selecting the a file	After selecting new file

Expected behavior

Step 1
After selecting the new file old files upload status must be remained not hided

Solution suggestion

Expected behavior differs by logic, I think the BitFileUploader must have some option that makes the consumer of the component to be able to choose to show previously selected and uploaded file after new file select and upload, or not