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 90.32258% with 27 lines in your changes missing coverage. Please review.

Project coverage is 82.79%. Comparing base (8224d28) to head (e6798f0).

Files with missing lines	Patch %	Lines
connection_configuration.go	90.44%	26 Missing ⚠️
driver.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1204      +/-   ##
==========================================
+ Coverage   82.61%   82.79%   +0.18%     
==========================================
  Files          54       55       +1     
  Lines       12916    13194     +278     
==========================================
+ Hits        10670    10924     +254     
- Misses       2246     2270      +24     

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[sfc-gh-dheyman-1]

Hi @sfc-gh-ext-simba-jy , unfortunately one of the added tests fails on MAC and UBUNTU machines:
=== RUN TestTokenFilePermission assert_test.go:97: expected to be not nil but was not. The error occurred because you cannot change the file permission. Thrown from /Users/runner/work/gosnowflake/gosnowflake/connection_configuration_test.go:23 +0x168 testing.tRunner(0xc000542000, 0x103690ee8) --- FAIL: TestTokenFilePermission (0.00s)