feat: remove BigQuery parser from monorepo (#37)

Remove the unused BigQuery (bq) parser directory and update CI workflow to exclude it from the parser matrix.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: h3n4l

.github/workflows/tests.yml

@@ -34,7 +34,7 @@ jobs:
         id: set-matrix
         run: |
           # List of all available parsers
-          ALL_PARSERS="redshift postgresql cql snowflake tsql doris trino plsql googlesql mysql partiql tidb bq mariadb cosmosdb"
+          ALL_PARSERS="redshift postgresql cql snowflake tsql doris trino plsql googlesql mysql partiql tidb mariadb cosmosdb"
           # Add more parsers here as they are added to the repository
           # ALL_PARSERS="redshift mysql postgresql"