Support Bytes and RawSlice input for Predicates

[camsjams]

Motivation

Requirements:

• Vectors can be returned from Contracts Improve Vector output support with Vec<> return #933
• Vectors can be sent to Predicates Improve Predicate Vector input support  #1083
• Bytes can be sent and returned from Contracts Add support for the new stdlib type Bytes and RawSlice for inputs and outputs for Contracts #1188
• Related Support heap types (Vector, Bytes, StdString) return from scripts #1187

Usage example

No response

Possible implementations

• Add input for Bytes for predicates
• Add input for RawSlice for predicates