dialects: (stream) remove abstract stream read and write operations

[superlopuh]

Another incremental change towards getting rid of the stream dialect, now that the definitions are small enough it feels like the right move is to duplicate the definitions, as there's no particular reason for them to be coupled.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.32%. Comparing base (f7088a0) to head (80c3ee6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3486      +/-   ##
==========================================
- Coverage   90.33%   90.32%   -0.01%     
==========================================
  Files         464      464              
  Lines       58026    58043      +17     
  Branches     5556     5557       +1     
==========================================
+ Hits        52415    52429      +14     
- Misses       4185     4187       +2     
- Partials     1426     1427       +1     

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