refactoring of connections state

[asmyasnikov]

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]

summary

Base version: v3.76.2-0.20240801103241-91cf42de33fa (master)
Cannot suggest a release version.
Can only suggest a release version when compared against the most recent version of this major: v3.76.2-rc0.

[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 gorm:

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[github-actions]

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

Grafana Dashboard

[github-actions]

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

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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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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 44.08602% with 104 lines in your changes missing coverage. Please review.

Project coverage is 41.74%. Comparing base (91cf42d) to head (cefa7d0).

Files	Patch %	Lines
internal/balancer/balancer.go	47.14%	31 Missing and 6 partials ⚠️
internal/conn/pool.go	0.00%	31 Missing ⚠️
internal/conn/conn.go	24.13%	20 Missing and 2 partials ⚠️
internal/balancer/cluster/cluster.go	78.84%	10 Missing and 1 partial ⚠️
internal/conn/grpc_client_stream.go	0.00%	2 Missing ⚠️
driver.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1352      +/-   ##
==========================================
- Coverage   41.85%   41.74%   -0.11%     
==========================================
  Files         351      350       -1     
  Lines       35226    35054     -172     
==========================================
- Hits        14745    14635     -110     
+ Misses      20000    19928      -72     
- Partials      481      491      +10     

Flag	Coverage Δ
go-1.20.x	43.62% <44.08%> (-0.07%)	⬇️
go-1.21.x	43.61% <44.08%> (-0.08%)	⬇️
go-1.22.x	41.70% <44.08%> (-0.13%)	⬇️
macOS	41.26% <44.24%> (-0.14%)	⬇️
ubuntu	41.27% <44.24%> (-0.12%)	⬇️
unit	41.74% <44.08%> (-0.11%)	⬇️
windows	41.73% <44.08%> (-0.12%)	⬇️

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