sequential - add sync tests for sse, jsonl & ndjson

[commonism]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 94.73684% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.27%. Comparing base (a40a640) to head (23c3a5b).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/aiopenapi3/request.py	88.88%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #423      +/-   ##
==========================================
+ Coverage   94.18%   94.27%   +0.08%     
==========================================
  Files         104      104              
  Lines        8363     8396      +33     
==========================================
+ Hits         7877     7915      +38     
+ Misses        486      481       -5     

Flag	Coverage Δ
core	94.27% <94.73%> (+0.08%)	⬆️
extras	94.27% <94.73%> (+0.08%)	⬆️

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