Support Bool?

[ericphanson]

Can be useful for dense multichannel true/false labels. One can just use UInt8's, but if only true/false is allowed then Bool is a natural representation for it, and moreover if whatever process is generating these labels outputs Matrix{Bool}, then if Onda supported Bool, it could be wrapped in Samples and encoded/decoded without copying.

Onda allows us to skip the copy if sample_type === eltype(sample_data) && sample_resolution_in_unit == 1 && sample_offset_in_unit == 0 but that means the label generating process would need to output UInt8's instead of Bools which can be less natural.

Additionally, maybe Onda could bitpack the Bools i.e. support a storage format like BitMatrix for 8x storage savings, although that sounds like a bigger lift to me.