[feature request] Better dependencies support

[AOne-T]

Component

None

Is your feature request related to a problem?

As is OpenTelementry latest SDK for .NET uses .NET SDK 8.0 but requires dependencies to .Net 9.0. It is a problem for those (as us) who target .Net 8.0 (as an LTS release). Thus we cannot use latest OTel packages and have to stay with those versions that still target .Net 8.0 libs.
Of course it requeires additional effort and to maintain *proj & props (and maybe cs) files but I doubt that there are many exclusive features that require .Net 9.
We implemented such an approach in our private nuget packages.

What is the expected behavior?

Nuget package with multiple target frameworks and separate dependencies for each

Which alternative solutions or features have you considered?

Stay on older versions

Additional context

No response

[thompson-tomo]

@AOne-T can you provide an example as I see no issue with the current approach and it not leading to any additional work/effort.