feat(snowflake): support SHOW ICEBERG TABLES

[treysp]

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[github-actions]

SQLGlot Integration Test Results

Comparing:

• this branch (sqlglot:trey/sf-show-iceberg, sqlglot version: trey/sf-show-iceberg)
• baseline (main, sqlglot version: 0.0.1.dev1)

By Dialect

dialect	main	sqlglot:trey/sf-show-iceberg	transitions	links
bigquery -> bigquery	23872/23877 passed (100.0%)	21252/21252 passed (100.0%)	No change	full result / delta
bigquery -> duckdb	2106/2624 passed (80.3%)	0/0 passed (0.0%)	No change	full result / delta
duckdb -> duckdb	4003/4003 passed (100.0%)	0/0 passed (0.0%)	No change	full result / delta
snowflake -> duckdb	1508/2674 passed (56.4%)	1508/2674 passed (56.4%)	No change	full result / delta
snowflake -> snowflake	65910/65910 passed (100.0%)	65910/65910 passed (100.0%)	No change	full result / delta
databricks -> databricks	1364/1364 passed (100.0%)	1364/1364 passed (100.0%)	No change	full result / delta
postgres -> postgres	6040/6040 passed (100.0%)	6040/6040 passed (100.0%)	No change	full result / delta
redshift -> redshift	7059/7059 passed (100.0%)	7059/7059 passed (100.0%)	No change	full result / delta

Overall

main: 113551 total, 111862 passed (pass rate: 98.5%), sqlglot version: 0.0.1.dev1

sqlglot:trey/sf-show-iceberg: 104299 total, 103133 passed (pass rate: 98.9%), sqlglot version: trey/sf-show-iceberg

Transitions:
No change

✅ 1 test(s) passed