fix: Add AS alias to semantic view query to preserve column names

[Synohara]

Summary

When using bind variables with identifier(?) in SEMANTIC_VIEW queries, Snowflake returns numeric column names (e.g., "2") instead of the actual dimension/metric/fact names. This causes WHERE and ORDER BY clauses to fail because they reference non-existent column names.

Changes

• Add AS {expr.name} alias to each identifier in DIMENSIONS, METRICS, and FACTS clauses
• This preserves column names while maintaining the security benefits of using bind variables

Example

Before (Error):

SELECT * FROM SEMANTIC_VIEW (identifier(?) DIMENSIONS identifier(?))
WHERE column_name = 'value'
-- Error: invalid identifier 'column_name'
-- Result columns have numeric names like "2" instead of actual names

After (Success):

SELECT * FROM SEMANTIC_VIEW (identifier(?) DIMENSIONS identifier(?) AS column_name)
WHERE column_name = 'value'
-- ✓ Works correctly
-- Result columns have proper names