Add Tab URL's and MIME type to download record

[Zawadidone]

In some cases the download URL isn't a valid link but a GUID blob:null/<GUID>, while the other tab URL related fields contain useful information about the origin of the downloaded file.

[Zawadidone]

Is it better to add the fields to the ChromiumMixin class?

[pyrco]

If these fields are only applicable to all chromium based browsers (Edge also does it this way?), then I'd add them there. If something like mime_type also becomes available for Firefox, we can always migrate that property to the generic record fields.

[Zawadidone]

Okay I will add the fields to the record (https://github.com/Zawadidone/dissect.target/blob/feature/chromium_tab_urls/dissect/target/plugins/browsers/chromium.py#L31), yes Edge also uses these fields.

[codecov]

Codecov Report

Merging #429 (4ae8308) into main (f24e6a2) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #429      +/-   ##
==========================================
+ Coverage   74.12%   74.14%   +0.01%     
==========================================
  Files         258      258              
  Lines       20631    20632       +1     
==========================================
+ Hits        15293    15297       +4     
+ Misses       5338     5335       -3     

Flag	Coverage Δ
unittests	74.14% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
dissect/target/plugins/browsers/chrome.py	100.00% <100.00%> (ø)
dissect/target/plugins/browsers/chromium.py	90.64% <100.00%> (+0.06%)	⬆️
dissect/target/plugins/browsers/edge.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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