Task: Implement ISpanFormattable on atomic types

[NightOwl888]

ISpanFormattable is implemented in Number with a substandard implementation. However, none of the atomic types are overriding it to provide an optimized implementation (which we already have implemented in DotNetNumber). So, we just need to add these overrides to significantly improve performance on these methods.

public override bool TryFormat(Span<char> destination, out int charsWritten, ReadOnlySpan<char> format = default, IFormatProvider? provider = null)
{
    return DotNetNumber.TryFormatInt64(Value, format, provider, destination, out charsWritten);
}

Unlike the types in J2N.Numerics, there is no reason to provide a static overload. This is just a convenience to format the value without first converting it to a .NET numeric type.

We will also need documentation. In general, the documentation can be copied from the TryFormat method in the corresponding type in J2N.Numerics.