SNOW-1634712 Support for toml file connection configuration

[sfc-gh-ext-simba-jy]

Description

SNOW-1634712 Please explain the changes you made here.

• support establishing connection to Snowflake by reading the connections.toml configuration file.

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 94.25837% with 24 lines in your changes missing coverage. Please review.

Project coverage is 82.83%. Comparing base (099708d) to head (9c8c150).

Files with missing lines	Patch %	Lines
connection_configuration.go	94.25%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1204      +/-   ##
==========================================
+ Coverage   82.52%   82.83%   +0.30%     
==========================================
  Files          54       55       +1     
  Lines       12916    13334     +418     
==========================================
+ Hits        10659    11045     +386     
- Misses       2257     2289      +32     

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