feat(transforms): add PostgreSQL lookup component for database queries

[ZhuBit]

Allow user to do sql lookup on external sources in middle of pipeline

[ZhuBit]

PostgreSQL Database Lookup component enables data enrichment by executing SQL queries against PostgreSQL databases. It supports dynamic query parameterization using input DataFrame values, making it ideal for per-row lookups and data augmentation workflows.

Dynamic Query Parameterization
Use a special placeholder syntax to reference input DataFrame columns in SQL queries:
SELECT * FROM users WHERE user_id = input.DataFrame({'UserId'});

The component automatically:
Detects placeholders in the query
Executes one query per input row
Replaces placeholders with actual values from each row
Handles SQL escaping and NULL values

Two Query Modes
Lookup Mode (with placeholders):
Executes one query per input DataFrame row
Replaces input.DataFrame({'ColumnName'}) with actual row values
Merges results back to corresponding input rows
Ideal for per-row enrichment

Normal Mode (without placeholders):
Executes query once
Applies result columns to all input rows
Useful for global lookups or constant values