Support encoding ArrayBuffer to bin directly

[Newbytee]

Using @msgpack/msgpack version 1.12.0 from npm, encoding an ArrayBuffer results in an empty object when decoding it. It would be desirable to have it encode as bin, as it would reduce the amount of redundant code required when encoding the result of functions such as SubtleCrypto.digest().

[gfx]

Even though some APIs directly return ArrayBuffer, I don't recommend to use it, as ArrayBuffer is a low-level memory buffer and designated to be wrapped by ArrayBufferView.

Please use extension types.