Allow pattern-matching on bytearrays

[KtorZ]

Preview

Source code	Compiler output

Remarks

• Doesn't allow pattern-matching on G1/G2 elements and strings, because the use cases for those is unclear and it adds complexity to the feature.
  • We still parse patterns on G1/G2 elements and strings, but emit an error in those cases.
  • The syntax is the same as for bytearray literals (i.e. supports hex, utf-8 strings or plain arrays of bytes).