[Feature] Add currency type to ad reporting

### Is there an existing feature request for this?

- [X] I have searched the existing issues

### Describe the Feature

Described here, but I cannot add comments to the thread :(
https://github.com/fivetran/dbt_google_ads/issues/43

This is not the secondary currencies feature. That is a Google Ads 360 feature. From the front end of GA, at the manager account level I am able to toggle on a "layer" that converts currency from CAD to USD, and I can build reports that use "converted currency" as a value. Thats the functionality I want to archive. This is available in the dbt Bing tables. I am happy to add these comments to the other thread, its just locked for me

### Describe alternatives you've considered

na

### Are you interested in contributing this feature?

- [ ] Yes.
- [ ] Yes, but I will need assistance and will schedule time during your [office hours](https://calendly.com/fivetran-solutions-team/fivetran-solutions-team-office-hours) for guidance.
- [X] No.

### Anything else?

_No response_