Translate std::vector<std::byte> into bytes during ABI generation

[conr2d]

In EOSIO ABI generation, std::vector<TYPE> is generally translated into TYPE[] that means contiguous repeat of TYPE, but std::vector specialization for uint8_t, int8_t, char, unsigned char are treated special by being translated into bytes that accepts hex string and convert it into byte sequence.

Since c++17, new type std::byte is supported for storing & accessing byte. Let's translate std::vector<std::byte> into bytes also.

You can start from:
https://github.com/turnpike/blanc/blob/bebefb3d/tools/include/eosio/gen.hpp#L533-L534