[WIP] Support Microsoft.OData.Core >= 8.0

[Remo]

This is an attempt to support Microsoft.OData.Core >= 8.0. Don't merge it, it's incomplete.

• I dropped support for .net7.0, .netstandard 2.0 and .net48
• I removed the sample projects from the solution, they don't compile yet.
• Some unit tests are failing, but mostly because we get OData and not odata in the URI.

[GerkinDev]

Hey there, can I help somehow with this ?

[Remo]

@GerkinDev I can't speak for the maintainer, but I guess we would have to fix the examples and understand why some URLs now contain OData instead of odata. Other than that, I haven't seen any issues so far, but it would also not hurt if more people would test this branch a bit better.

[GerkinDev]

I've tried running it in my app directly, without success. But since the app is mid-size, it can totally be caused by something else. I'll dig deeper and try to come with some help if I can

[GerkinDev]

Hello, FYI I've managed to fully migrate my app to .net 8.0, and your fork works just fine :)

[Remo]

@robertmclaws since you seem to own this repo, what is your take on this? Would it be okay if we would remove backwards compatibility and make everything run on .net 8 only?

[ajtowf]

This PR should be merged as-is, what's the hold up?

[Remo]

The examples are gone and some tests are failing. It would be good if this could be fixed.