feat: introduce httplb for ut

[lvrach]

• feat: introduce httplb library
• add configs for stdlib
• use common transport configurations
• use common transport configurations

Description

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Linear Ticket

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Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Attention: Patch coverage is 6.83761% with 109 lines in your changes missing coverage. Please review.

Project coverage is 74.73%. Comparing base (f22e8f4) to head (b78648b).

Files with missing lines	Patch %	Lines
processor/transformer/embeded/pubsub.go	0.00%	56 Missing ⚠️
processor/transformer/transformer.go	19.04%	34 Missing ⚠️
utils/sysUtils/httpclient.go	0.00%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5375      +/-   ##
==========================================
+ Coverage   74.68%   74.73%   +0.05%     
==========================================
  Files         437      439       +2     
  Lines       61240    61350     +110     
==========================================
+ Hits        45737    45850     +113     
- Misses      12954    12972      +18     
+ Partials     2549     2528      -21     

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