feat: Allow loading media as blob:

[artonge]

And set the Content-Type header in proxied GET responses.

Related to nextcloud/viewer#2691

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 37.72%. Comparing base (f841a92) to head (b5d0cab).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/files.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #867      +/-   ##
==========================================
+ Coverage   37.56%   37.72%   +0.15%     
==========================================
  Files          33       33              
  Lines        1448     1450       +2     
  Branches       76       76              
==========================================
+ Hits          544      547       +3     
+ Misses        902      901       -1     
  Partials        2        2              

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