Bug: Fix data engine not being able to download files with reserved URL symbols in the file paths

[kbolashev]

Reproduction:

• Create a file structure that includes a # symbol somewhere in the path. For example a file at the path aaa # bbb/file.txt
• Create a datasource from that structure
• Run:

# get datasource before that
ds.all().download_files()

The file with the hash symbol will fail to download.

I added a test that checks that the hash doesn't show up

[dagshub]

Join the discussion on DagsHub!

[simonlsk]

LGTM (As in looks great to me)