Add examples, mocks, and tests for stream feature of OpenAI models

[hmirin]

close #6

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[codecov[bot]]

Codecov Report

Merging #7 (e8665ae) into main (46efac4) will increase coverage by 0.71%. The diff coverage is 57.89%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   51.09%   51.81%   +0.71%     
==========================================
  Files          16       16              
  Lines        1004     1019      +15     
==========================================
+ Hits          513      528      +15     
  Misses        491      491              

Files Changed	Coverage Δ
src/prompttrail/provider/openai.py	75.75% <52.94%> (-2.82%)	:arrow_down:
src/prompttrail/core.py	83.87% <100.00%> (+6.45%)	:arrow_up:

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