This introduces a new `Bytes` standard library class, for working with
binary data.
* Add Bytes class to the standard library
* Change CLI to eval `output.bytes`
* Change code generators to map Bytes to respective underlying type
* Add subscript and concat operator support
* Add binary encoding for Bytes
* Add PCF and Plist rendering for Bytes
Co-authored-by: Kushal Pisavadia <kushi.p@gmail.com>
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