Don't use buffered output in SapiEmitter when body size is less than buffer

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues

[what-the-diff]

PR Summary

• Enhancement of Change Log
  The CHANGELOG.md file now includes two major improvements:

  • Enhancement Stream output #58 elevates the support for stream output headers.
  • Enhancement Don't use buffered output in SapiEmitter when body size is less than buffer #64 enables the SapiEmitter to operate more efficiently by bypassing buffered output when the body size is smaller than the buffer.

• Modification of SapiEmitter File
  The SapiEmitter.php file has been revised with the following changes:

  • A new emitContent method has been introduced. This is a private method specifically developed to handle content emission efficiently.
  • The emitBody method has been enhanced. It now employs the new emitContent method to emit content from the response body.
  • A conditional check has been added to the emitBody method. This allows for immediate content emission when the body size falls below or equals the buffer size, thereby optimizing performance.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.43%. Comparing base (e635091) to head (9668804).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #64   +/-   ##
=========================================
  Coverage     99.42%   99.43%           
- Complexity      115      118    +3     
=========================================
  Files             5        5           
  Lines           346      351    +5     
=========================================
+ Hits            344      349    +5     
  Misses            2        2           

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