[Feature] Support select field

[UncleFB]

Is this your first time submitting a feature request?

• [X] I have read the expectations for open source contributors
• [X] I have searched the existing issues, and I could not find an existing issue for this feature
• [X] I am requesting a straightforward extension of existing metricflow functionality, rather than a Big Idea better suited to a discussion

Describe the feature

Suppose I don’t want to use metric and can only use dimension to add select fields, but this field will appear in groupby. Can you support adding fields only to select?

Describe alternatives you've considered

No response

Who will this benefit?

No response

Are you interested in contributing this feature?

No response

Anything else?

No response

[Jstein77]

@UncleFB mind saying a bit more about the use case here? It sounds like you essentially want to query the underlying model using the semantic layer.