snowflake: WITH TAG dotted names

[lustefaniak]

Problem:
The lineage parser failed to parse CREATE TABLE statements with schema-qualified or fully-qualified tag names in the WITH TAG clause. For example: WITH TAG (STAGE.TAG_SCHEMA.DOMAIN_MAPPING='marketing')

Root Cause:
The SqlOption struct used WithSpan for the tag name, which only supports simple identifiers. Snowflake allows multi-part tag names like:

• Simple: TAG_NAME='value'
• Schema-qualified: SCHEMA.TAG_NAME='value'
• Fully-qualified: DB.SCHEMA.TAG_NAME='value'

Solution:

1. Changed SqlOption.name from WithSpan to ObjectName
2. Updated parse_sql_option to use parse_object_name() instead of parse_identifier()
3. Added comprehensive tests for all tag qualification levels
4. Updated existing test assertions to use ObjectName format

Impact:

• Lineage parser can now extract lineage from tables with dotted tag names
• All tag qualification levels are supported
• Backward compatible with simple tag names

Files Changed:

• src/ast/mod.rs: Updated SqlOption struct
• src/parser/mod.rs: Updated parse_sql_option function
• tests/sqlparser_snowflake.rs: Added comprehensive tag name tests
• tests/sqlparser_common.rs: Updated test assertions
• tests/sqlparser_postgres.rs: Updated test assertions