Add int8_to_bit and bit_to_int8 conversion as a language operator

[bradunov]

• Add int8_to_bit and bit_to_int8 conversion as a language operator. For example, int8_to_bit(7) should return {'0, '1, '1, '1} bit array. It is beneficial to have this in a language as it is a simple and frequently used operation, so it is worth doing it efficiently.