Easier way to create ScalarValue::Struct

[alamb]

Is your feature request related to a problem or challenge?

While updating InfluxDB with the changes to ScalarValue::Struct #7893 I found it challenging to figure out how to construct ScalarValue::Struct from other ScalarValues -- the APIs are all there, but it was confusing

Describe the solution you'd like

I would like examples on how to create ScalarValue::Struct and/or a builder that makes it easier to do so (maybe just making the APIs discoverable)

Describe alternatives you've considered

No response

Additional context

I have some ideas related