Incomplete collation comparison logic

## Problem
`data_diff/abcs/database_types.py:56,84` — Collation comparison doesn't handle language/country alignment.

## Impact
Collation mismatches may not be detected when comparing schemas across databases.

## Suggested Fix
Implement proper collation comparison considering language and country codes.

## References
- File: `data_diff/abcs/database_types.py`, lines 56, 84