split up FSharp.Data take 2

[dsyme]

Continues #1457 after #1459 caused revert #1460

Will require this workaround in the TypeProvider SDK fsprojects/FSharp.TypeProviders.SDK#388

[dsyme]

I've manually tested that updating to the latest TPSDK with the workaround makes the packages usable.

#i """nuget: C:\GitHub\dsyme\FSharp.Data\bin"""
#r "nuget: FSharp.Data, 5.0.3"

open FSharp.Data
type Auth = JsonProvider<"""{ "test": 1 }""">
let auth = Auth.Parse("""{ "test": 1 }""")
printfn $"{auth.Test}"

Then

fsi.exe a.fsx      

and editing a.fsx in Visual Studio.

It's not easy to automate this testing - our doc generation does consume the DLLs but not the packages we build. (Consuming built packages within the build itself is always surprisingly painful with .NET, as you have to use a local soure and make sure you're really getting the package version you built)

[dsyme]

Changed the version number to 6.0.1-beta001