Missing System.Numerics.Vector* APIs between RC1 and RC2/GA

[jozkee]

@tannergooding I see these APIs ported to RC1 dotnet/dotnet#2016 but not to RC2?

https://github.com/dotnet/runtime/commits/release/10.0-rc2/src/libraries/System.Private.CoreLib/src/System/Numerics/Vector.cs

https://github.com/dotnet/dotnet/blob/release/10.0.1xx-rc2-branding-update/src/runtime/src/libraries/System.Private.CoreLib/src/System/Numerics/Vector.cs
(I don't know if this is the right VMR rc2 branch)

Originally posted by @jozkee in dotnet/core#10138 (comment)

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