Add IRIS as a new agent-driven database type with:
- iris:// connection URL scheme (default port 1972, user _SYSTEM)
- JDBC driver via agent (com.intersystems.jdbc.IRISDriver)
- Oracle-compatible DDL dialect and schema-aware SQL dialect
- Capability sets: schema-aware, tree schema, diagram, search, table structure
Closes#368
PostgreSQL array columns were serialized as JSON arrays (e.g. [1,2,3])
by serde_json::Value::Array Display, producing invalid SQL literals like
'[1,2,3]' and '[]' instead of PostgreSQL's required '{1,2,3}' and '{}'.
Add format_pg_array_sql_literal helper and apply it to all three SQL
literal formatting paths: escape_value_typed (transfer), format_export_sql_literal
(database_export), and format_grid_sql_literal (data_grid_sql).
t8y2