Draft: Fix consistency col perf

Fix by factorizing usage of existing function get_column_array:

• move get_column_array from routers/bulk/utils.py into dedicated module inside bulk_persistence to make it reusable.
• delete the faulty function from consistency_check
• update routers\bulk\utils, welllog consistency, trajectory consistency to use the same function from bulk_persistence
• add tests to ensure it can handle 100k+ curves/columns