Add account_usage config to query a alternate schema

[mars-lan]

🤔 Why?

Granting access to the entire SNOWFLAKE database may not always be desirable. The connector should be able to query from a different schema that mirrors the minimally needed views (QUERY_HISTORY, ACCESS_HISTORY, TAG_REFERENCES).

🤓 What?

As titled.

🧪 Tested?

Verified against a production instance with mirrored views.

☑️ Checks

• My PR contains actual code changes, and I have updated the version number in pyproject.toml.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
11723	10420	89%	85%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
metaphor/snowflake/config.py	100%	🟢
metaphor/snowflake/extractor.py	85%	🟢
TOTAL	92%	🟢

updated for commit: a7d41df by action🐍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.88%. Comparing base (d966e3a) to head (a7d41df).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #936   +/-   ##
=======================================
  Coverage   88.88%   88.88%           
=======================================
  Files         182      182           
  Lines       11721    11723    +2     
=======================================
+ Hits        10418    10420    +2     
  Misses       1303     1303           

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[elic-eon]

LGTM!