Move Extensions to separate F#+ Core assembly

[wallymathieu]

No description provided.

[Copilot]

Pull request overview

This PR refactors FSharpPlus by extracting Extensions functionality into a new separate FSharpPlus.Core assembly. The refactoring updates the language version from 8.0 to 10.0 and removes pinned FSharp.Core 6.0.6 dependencies across multiple projects. The PR also comments out several tests that encounter F# compiler regressions with the newer version.

• Removed 26+ extension files from FSharpPlus.fsproj and created new FSharpPlus.Core project containing them
• Updated .NET SDK version from 8.0.0 to 10.0.0 and modified CI workflows accordingly
• Commented out problematic tests due to F# compiler type inference regressions

Reviewed changes

Copilot reviewed 20 out of 47 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/FSharpPlus.Core/FSharpPlus.Core.fsproj	New project file defining the FSharpPlus.Core assembly with LangVersion 8.0 and all extension files
src/FSharpPlus.Core/Internals.fs	New file containing internals code moved from FSharpPlus, including BitConverter, FindSliceIndex, and utility modules
src/FSharpPlus.Core/Extensions/ValueTask.fs	Visibility changed from internal to public for active patterns and helper functions
src/FSharpPlus/FSharpPlus.fsproj	Removed 26+ extension file references, updated LangVersion to 10.0, added project reference to FSharpPlus.Core
src/FSharpPlus/Internals.fs	Removed code moved to FSharpPlus.Core (Traces module, Errors, Decimal, Rational, BigInteger, BitConverter, FindSliceIndex modules)
src/FSharpPlus/Data/NonEmptySeq.fs	Fixed range expression syntax by wrapping in seq { }
tests/FSharpPlus.Tests/General.fs	Commented out tests encountering F# compiler type inference regressions and memoization assertion issues
tests/FSharpPlus.Tests/Traversals.fs	Commented out tests that likely fail with the new setup
tests/FSharpPlus.Tests/FSharpPlus.Tests.fsproj	Removed FSharp.Core version pin
tests/FSharpPlusFable.Tests/FSharpPlusFable.Tests.fsproj	Removed FSharp.Core version pin
src/FSharpPlus.TypeLevel/FSharpPlus.TypeLevel.fsproj	Removed FSharp.Core version pin
src/FSharpPlus.TypeLevel/Providers/FSharpPlus.Providers.fsproj	Removed FSharp.Core version pin
src/FSharpPlus.Docs/FSharpPlus.Docs.fsproj	Removed FSharp.Core version pin
src/FSharpPlus.Docs/Samples/Collections.fsx	Added warning number to nowarn directive
global.json	Updated SDK version from 8.0.0 to 10.0.0, removed 5.0.405 and 7.0.100, added 8.0.100
build.proj	Changed build commands to compile specific projects rather than entire solution
FSharpPlus.sln	Added FSharpPlus.Core project to solution with all configuration mappings
.github/workflows/*.yml	Updated CI workflows to use .NET 10.0.x instead of 7.0.x

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