Draft: remove dtypes from bulk catalog

Summary

Remove dtypes field from bulk catalog. Motivations are:

• this info is not used
• data are misleading because the order is not preserved
• compatibiliy with catalog generated by bulk worker service

This is only internal cook but this implies bulk data writtent using newer version won't be readable by older version (no forward compatibility).

Type of change

• 🔧 Refactoring that neither fixes a bug nor adds a feature

Validation

• New tests added
• Covered by the unit tests
• Covered by the integration tests
• Non functional testing (performance, scalability, security ...)
• Manual testing, description: