[maximeroucher]

Type binary/file response bodies as Future<chopper.Response<List<int>>> instead of String/dynamic, so file/stream downloads are properly typed.

• Detects binary responses across OpenAPI 2.0 (type: file), 3.0 (type: string, format: binary) and 3.1 (type: string, contentMediaType: ...).
• Teaches the generated $JsonSerializableConverter to return response.bodyBytes for a List<int> result type instead of JSON-decoding.
• Adds the contentMediaType field to SwaggerSchema (OpenAPI 3.1) which the binary detection relies on.
• Adds tests covering the 3.0 and 3.1 shapes.

Relates to #116 (byte responses support).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.97%. Comparing base (a08d9a4) to head (2576ff6).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #854      +/-   ##
==========================================
+ Coverage   63.65%   63.97%   +0.32%     
==========================================
  Files           9        9              
  Lines        1183     1188       +5     
==========================================
+ Hits          753      760       +7     
+ Misses        430      428       -2     

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