feat : add get bytes

[shbae-musma]

get bytes 구현

[chipweinberger]

this will not work on iOS. Therefore, I do not want to add it.

Why do you need it? All of the data should already be exposed, no?

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also final String scanBytes should be List<int>

[shbae-musma]

I will make sure to modify the iOS source code later. Thank you very much.

[chipweinberger]

iOS does not allow raw bytes.

It cannot be supported on iOS.

[shbae-musma]

Wow, I didn't know that, thank you for letting me know!