SNOW-1029631: Optimize streaming PUT memory usage

[sfc-gh-ext-simba-jl]

Description

Optimize streaming PUT memory usage.
Compared the memory usage for uploading 1GB file using runtime.ReadMemStats
Before change: 11GB
After change: 1.5GB

Checklist

• Created tests which fail without the change (if possible)
• Extended the README / documentation, if necessary

[codecov]

Codecov Report

Attention: Patch coverage is 71.95122% with 23 lines in your changes missing coverage. Please review.

Project coverage is 82.13%. Comparing base (3364567) to head (cd542f1).

Files with missing lines	Patch %	Lines
file_transfer_agent.go	59.25%	11 Missing ⚠️
file_util.go	54.54%	10 Missing ⚠️
connection_util.go	93.54%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1266      +/-   ##
==========================================
- Coverage   82.19%   82.13%   -0.07%     
==========================================
  Files          55       55              
  Lines       13484    13539      +55     
==========================================
+ Hits        11083    11120      +37     
- Misses       2401     2419      +18     

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