ConfigurableArrayPool shoud use GC.AllocateUninitializedArray<T>

[PavelCibulka]

ConfigurableArrayPool shoud use GC.AllocateUninitializedArray instead of new T[].

SharedArrayPool use GC.AllocateUninitializedArray:

buffer = GC.AllocateUninitializedArray<T>(minimumLength);

There are four line with new T[] in ConfigurableArrayPool.cs. Probably all of them can be replaced with GC.AllocateUninitializedArray.

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[PavelCibulka]

GC.AllocateUninitializedArray isn’t always faster than T[]. I've been misled by the function name.