some refactor of experimental topic helpers

[rekby]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Other information

[github-actions]

github.com/ydb-platform/ydb-go-sdk/v3/topic/topicsugar

incompatible changes

TopicUnmarshalJSONFunc: removed
TopicUnmarshalJSONIterator: removed

compatible changes

BytesIterator: added
IteratorFunc: added
JSONIterator: added
ProtobufIterator: added
StringIterator: added

summary

Base version: v3.80.9 (master)
Cannot suggest a release version.
Incompatible changes were detected.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 14 lines in your changes missing coverage. Please review.

Project coverage is 67.88%. Comparing base (4d75f71) to head (eb6cb0c).

Files with missing lines	Patch %	Lines
topic/topicsugar/iterators.go	30.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1475      +/-   ##
==========================================
- Coverage   67.99%   67.88%   -0.11%     
==========================================
  Files         352      352              
  Lines       36436    36455      +19     
==========================================
- Hits        24773    24747      -26     
- Misses      10583    10619      +36     
- Partials     1080     1089       +9     

Flag	Coverage Δ
experiment	72.14% <43.75%> (-0.08%)	⬇️
go-1.21.x	68.14% <ø> (-0.06%)	⬇️
go-1.22.x	65.73% <ø> (-0.01%)	⬇️
go-1.23.x	67.83% <33.33%> (-0.05%)	⬇️
integration	54.08% <43.75%> (-0.14%)	⬇️
macOS	40.86% <0.00%> (-0.02%)	⬇️
ubuntu	72.33% <43.75%> (-0.12%)	⬇️
unit	41.29% <0.00%> (-0.03%)	⬇️
windows	41.29% <0.00%> (-0.03%)	⬇️
ydb-23.3	47.45% <37.50%> (-0.22%)	⬇️
ydb-24.1	53.94% <43.75%> (-0.17%)	⬇️
ydb-24.2	53.94% <43.75%> (-0.05%)	⬇️
ydb-nightly	72.14% <43.75%> (-0.08%)	⬇️

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[github-actions]

🌋 Here are results of SLO test for Go SDK gorm:

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[github-actions]

🌋 Here are results of SLO test for Native ydb-go-sdk/v3 over table-service:

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[github-actions]

🌋 Here are results of SLO test for Go SDK xorm:

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[github-actions]

🌋 Here are results of SLO test for Native ydb-go-sdk/v3 over query-service:

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[github-actions]

🌋 Here are results of SLO test for Go SDK database/sql:

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