feat(snowflake)!: Support transpilation of TO_DATE from snowflake to duckdb

[fivetran-felixhuang]

https://docs.snowflake.com/en/sql-reference/functions/to_date

The transpilation of TO_DATE mostly works. The only case that doesn't work is when the input is an expression that evaluates to a string containing an integer

[github-actions]

SQLGlot Integration Test Results

Comparing:

• this branch (sqlglot:transpile_to_date_snowflake_duckdb, sqlglot version: transpile_to_date_snowflake_duckdb)
• baseline (main, sqlglot version: 28.5.1.dev49)

⚠️ Limited to dialects: duckdb, snowflake

By Dialect

dialect	main	sqlglot:transpile_to_date_snowflake_duckdb	difference	links
duckdb -> duckdb	4003/4003 passed (100.0%)	4003/4003 passed (100.0%)	No change	full result / delta
snowflake -> duckdb	626/1085 passed (57.7%)	626/1085 passed (57.7%)	No change	full result / delta
snowflake -> snowflake	981/1085 passed (90.4%)	981/1085 passed (90.4%)	No change	full result / delta

Overall

main: 6173 total, 5610 passed (pass rate: 90.9%), sqlglot version: 28.5.1.dev49

sqlglot:transpile_to_date_snowflake_duckdb: 6173 total, 5610 passed (pass rate: 90.9%), sqlglot version: transpile_to_date_snowflake_duckdb

Difference: No change

[georgesittas]

Thanks for taking a stab at this @fivetran-felixhuang, but given the nuances of this transpilation I'd say let's hold off dealing with this for now. Refer to my reply in the corresponding Jira ticket as well.