[Feature] Update metrics spec to be 1.6 compatiable

[Jstein77]

Is there an existing feature request for this?

• [X] I have searched the existing issues

Describe the Feature

dbt-core has a new metric spec as of 1.6. We need to update the metrics in the package to be compatible with the new spec.

Describe alternatives you've considered

Remove metrics, or only use the package on dbt versions <1.6

Are you interested in contributing this feature?

• [X] Yes.
• [ ] Yes, but I will need assistance and will schedule time during your office hours for guidance.
• [ ] No.

Anything else?

No response

[fivetran-joemarkiewicz]

This update has been reflected in the latest v1.6.0 release of the ad reporting package! As such, I will close out this issue. Thanks again for contributing to the package @Jstein77!