Add SnowflakeSource

[philippjfr]

Adds a SnowflakeSource using the snowflake-connector-python library.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 115 lines in your changes missing coverage. Please review.

Project coverage is 60.43%. Comparing base (2c83a1b) to head (607dffa).

Files with missing lines	Patch %	Lines
lumen/sources/snowflake.py	0.00%	115 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #776      +/-   ##
==========================================
- Coverage   60.98%   60.43%   -0.56%     
==========================================
  Files         103      104       +1     
  Lines       12544    12659     +115     
==========================================
  Hits         7650     7650              
- Misses       4894     5009     +115     

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[jbednar]

Few if any of these parameters seem specific to Snowflake compared to any other authenticated SQL database. I guess it's fine to define them here for now, and move the shared parameters to a base class once support for the next type of authenticated SQL is added? I actually can't detect any code in this class that is specific to Snowflake, so maybe this class is actually just a prototype for AuthenticatedSQLSource, tested on Snowflake so far but potentially usable for other systems as well?

[ahuang11]

We might want to consider using SQLAlchemy as the interface to specific SQL engines/dialects.