[FEATURE] - Add `persist_pass_through_columns` -capability for non-mapping passthrough variables

Currently when a non-mapped passthrough/list-style variable is passed to `persist_pass_through_columns` macro, no error occurs but blank fields are generated. This macro should be updated to handle either list- or dict- style variables. The logic used in [`fill_pass_through_columns`](https://github.com/fivetran/dbt_fivetran_utils/blob/releases/v0.4.latest/macros/fill_pass_through_columns.sql) is an example of how this could be done.

This will allow this macro to be brought into older packages, that might not yet use this macro and therefore are expecting list-style, with less friction on the user's end as they will not have to change their variables.