Ensure data types are specified correctly in all model configs

[katy-sadowski]

Ensure all columns have a data type specified, and that that data type is correct in :

• https://github.com/OHDSI/dbt-synthea/blob/main/models/staging/vocabulary/_vocabulary__model.yml
• https://github.com/OHDSI/dbt-synthea/blob/main/models/staging/synthea/_synthea__models.yml
• https://github.com/OHDSI/dbt-synthea/blob/main/models/omop/_omop__models.yml

As well as in the seed datatypes specified here:

• https://github.com/OHDSI/dbt-synthea/blob/main/dbt_project.yml#L21-L87