[Feature] Include currency code whenever there is an amount in a currency on display in any model

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

- [X] I have searched the existing issues

### Describe the Feature

Include currency code whenever there is an amount in a currency on display in any model. This helps everyone who realize not all currencies are USD ;)

This issue has actually already been solve in this PR:
https://github.com/fivetran/dbt_google_ads/pull/36

### Describe alternatives you've considered

_No response_

### Are you interested in contributing this feature?

- [X] 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.
- [ ] No.

### Anything else?

I have communicated with Joe Markiewicz (Fivetran) in the Slack community _dbt_. He requested I open another request here.