EnumInfo<T>.s_memberByValue is not necessary when continuous.

[akeit0]

FastEnum/src/libs/FastEnum.Core/Internals/EnumInfo.cs

Line 25 in db9a379

public static readonly FastReadOnlyDictionary<T, Member<T>> s_memberByValue;

As far as I can see, s_memberByValue is unnecessary when EnumInfo.s_isContinuous.