🐛 [firestore-bigquery-export] add partition field to raw_latest view

### [REQUIRED] Step 2: Extension name

This feature request is for extension: firestore-bigquery-export

### What feature would you like to see?

User selected partition field in extension config should be added to the raw_latest view
Currently it is included in raw_changelog table but not in the raw_latest view

### How would you use it?

Goal would be to be able to benefit from filter push down and partition pruning when querying the raw_latest view. This would increase performance and reduce cost.