feature: Expose a streaming entity parser

[aiven-anton]

Proof of concept for a streaming entity reader.

[codecov-commenter]

Codecov Report

:x: Patch coverage is 35.29412% with 44 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 96.32%. Comparing base (bd29715) to head (60bc22a).

Files with missing lines	Patch %	Lines
src/kio/serial/_streaming_parser.py	34.32%	44 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #259      +/-   ##
===========================================
- Coverage   100.00%   96.32%   -3.68%     
===========================================
  Files           18       19       +1     
  Lines         1129     1197      +68     
  Branches       135      144       +9     
===========================================
+ Hits          1129     1153      +24     
- Misses           0       44      +44     

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