[Bug] Rename `SavedQuery.group_bys` to `SavedQuery.group_by`

Is this a new bug in dbt-semantic-interfaces?

[X] I believe this is a new bug in dbt-semantic-interfaces
[X] I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

In the Github issue describing the saved query feature (https://github.com/dbt-labs/metricflow/issues/765), there was a typo in the group_bys field - the author mentioned that it was supposed to be group_by.

Expected Behavior

SavedQuery.group_bys should be SavedQuery.group_by.

Steps To Reproduce

N/A

Relevant log output

No response

Environment

- OS: N/A
- Python: N/A
- dbt: N/A
- dbt-semantic-interfaces: 0.3

Additional Context