Improve bool.TryFormat perf (#18711)

Improve bool.TryFormat perf (#18711)

* Improve bool.TryFormat perf

Improves throughput by ~50%, by avoiding AsSpan().CopyTo and just writing out the characters one-by-one.  I experimented with playing the same tricks around storing the data in a ulong and blitting it out to the destination reinterpreted as a span of ulongs, but it didn't make a measurable improvement and increased the code complexity.

* Update Boolean.cs