2.0.0

dotnet7 (#108)

* fix obsolescence warning on ForEachAsyncSemaphore

* nuget updates

* drop .netstandard support, added .net 7 +semver: major

* misc updates

* added devcontainer

* fix code coverage

* change wf to tagged actions

* devcontainer to .net 7

* fix tests

* coverage fix

* try this

* fix

* nullability

* compound operator

* nullability fix

* nullability fix

* nullability fix

* nullable fix

* nullable fix

* disable sq

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