Refactor serializer::stream

[ashtum]

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[cppalliance-bot]

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[cppalliance-bot]

An automated preview of the documentation is available at https://147.http-proto.prtest.cppalliance.org/index.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.46%. Comparing base (e6330db) to head (d4044de).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #147      +/-   ##
===========================================
+ Coverage    91.41%   91.46%   +0.05%     
===========================================
  Files           76       76              
  Lines         5020     5027       +7     
===========================================
+ Hits          4589     4598       +9     
+ Misses         431      429       -2     

Files with missing lines	Coverage Δ
include/boost/http_proto/detail/header.hpp	100.00% <ø> (ø)
include/boost/http_proto/serializer.hpp	100.00% <ø> (ø)
src/serializer.cpp	90.29% <100.00%> (+0.52%)	⬆️

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[cppalliance-bot]

An automated preview of the documentation is available at https://147.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://147.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://147.http-proto.prtest.cppalliance.org/index.html