[5.x] Add `Range` header support

[vangheem]

https://developer.mozilla.org/en-US/docs/Web/HTTP/Range_requests

Range requests allow us to do partial and resumable downloads.

This will also allow media players to seek inside of a file.

[codecov-io]

Codecov Report

Merging #803 into 5.x will increase coverage by 0.2%. The diff coverage is 100%.

@@           Coverage Diff           @@
##             5.x    #803     +/-   ##
=======================================
+ Coverage   94.2%   94.4%   +0.2%     
=======================================
  Files        305     306      +1     
  Lines      27133   27385    +252     
=======================================
+ Hits       25540   25827    +287     
+ Misses      1593    1558     -35

Impacted Files	Coverage Δ
guillotina/tests/dbusers/test_api.py	100% <ø> (ø)	:arrow_up:
guillotina/files/adapter.py	96.7% <100%> (+2.1%)	:arrow_up:
guillotina/traversal.py	86.9% <100%> (ø)	:arrow_up:
guillotina/tests/test_attachment.py	100% <100%> (ø)	:arrow_up:
guillotina/test_package.py	96.6% <100%> (+2.1%)	:arrow_up:
guillotina/files/manager.py	100% <100%> (+13.8%)	:arrow_up:
guillotina/blob.py	97% <100%> (+5.9%)	:arrow_up:
guillotina/tests/fixtures.py	93.2% <100%> (+0.1%)	:arrow_up:
guillotina/files/exceptions.py	100% <100%> (ø)
guillotina/interfaces/files.py	100% <100%> (ø)	:arrow_up:
... and 4 more