Add Dencun fields to postgres_tables.py

[medvedev1088]

This pull request encompasses updates and enhancements to the data conversion logic and schema definitions within the Ethereum ETL project. Key updates include improvements to the SimpleItemConverter class for conditional field conversion, expansion of the item exporter creator to include a new converter, and updates to the PostgreSQL schema definitions to accommodate new fields.

Key Changes:

• Data Conversion Logic Updated: Enhanced the SimpleItemConverter to support conditional conversion of fields based on a set of predefined converters.
• Exporter Updates: Modified the item exporter creator to include a new SimpleItemConverter, improving the handling of specific fields like blob_versioned_hashes.
• Schema Expansion: Updated PostgreSQL schema definitions for blocks and transactions to include new fields such as blob_gas_used, excess_blob_gas, and more.