fix: support for compressed content in download2stream method.

[bigcat88]

Fixes #352 .

By switching from iter_raw to iter_bytes, httpx will automatically handle the decompression if the Content-Encoding: gzip header is present. If the header is absent or specifies no compression (like identity), iter_bytes will yield the original bytes, just like iter_raw would have.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.13%. Comparing base (57c6d34) to head (c224f43).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #353   +/-   ##
=======================================
  Coverage   95.13%   95.13%           
=======================================
  Files          45       45           
  Lines        5325     5325           
=======================================
  Hits         5066     5066           
  Misses        259      259           

Files with missing lines	Coverage Δ
nc_py_api/_session.py	94.20% <100.00%> (ø)

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