feat(snowflake): get_catalog_names

[betodealmeida]

SUMMARY

Implement get_catalog_names for Snowflake. This is needed to support catalog-level permissions, and also for #22862.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

I configured a Snowflake database and ran this script:

from superset.app import create_app

app = create_app()
with app.app_context():
    from superset import db
    from superset.db_engine_specs.snowflake import SnowflakeEngineSpec
    from superset.models.core import Database

    database = db.session.query(Database).first()
    with database.get_inspector_with_context() as inspector:
        print(SnowflakeEngineSpec.get_catalog_names(database, inspector))

When ran, it produced the expected output:

['SNOWFLAKE_SAMPLE_DATA']      

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #23602 (2f326df) into master (c5eecc7) will increase coverage by 0.00%.
The diff coverage is 85.71%.

❗ Current head 2f326df differs from pull request most recent head 4d703c8. Consider uploading reports for the commit 4d703c8 to get more accurate results

@@           Coverage Diff           @@
##           master   #23602   +/-   ##
=======================================
  Coverage   67.72%   67.72%           
=======================================
  Files        1916     1916           
  Lines       74051    74058    +7     
  Branches     8040     8040           
=======================================
+ Hits        50153    50159    +6     
- Misses      21850    21851    +1     
  Partials     2048     2048           

Flag	Coverage Δ
hive	52.75% <85.71%> (+<0.01%)	⬆️
mysql	78.49% <85.71%> (+<0.01%)	⬆️
postgres	78.57% <85.71%> (+<0.01%)	⬆️
presto	52.68% <85.71%> (+<0.01%)	⬆️
python	82.41% <85.71%> (+<0.01%)	⬆️
sqlite	77.07% <85.71%> (+<0.01%)	⬆️
unit	52.65% <85.71%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
superset/db_engine_specs/snowflake.py	67.25% <80.00%> (+0.38%)	⬆️
superset/db_engine_specs/bigquery.py	69.66% <100.00%> (+0.11%)	⬆️
superset/db_engine_specs/postgres.py	97.12% <100.00%> (+0.02%)	⬆️

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