[WIP] Added support syntax assign-bitwise operators

[KorsaR-ZN]

New syntax, see #1056

let a &= b;
let a |= b;
let a ^= b;
let a <<= b;
let a >>= b;

Progress list

• Add parsing new syntax
• Add compiling new syntax only assign-type: variable
• Add compiling new syntax other assign-type
• Add tests only assign-type: variable
• Add tests other assign-type

[fezfez]

👍

[sergeyklay]

@KorsaR-ZN Could you please rebase