Change parser to parse <= and >= as nested BinaryOperation nodes

[alexdovzhanyn]

The binaryen IR doesn't support <= and >= operations directly. We could change our CodeGen to generate nested binaryen expressions if we come across a <= or >= sign, but we may as well simplify our own AST structure to match the binaryen IR.

Changing the parser to parse the <= and >= operations as:

5 >= 6

BinaryOperation
  op: "||"
  left:
    BinaryOperation
      op: ">"
      left: "5"
      right: "6"
  right:
    BinaryOperation
      op: "=="
      left: "5"
      right: "6"  

will allow a much simpler CodeGen process.

• [ ] Update parser to parse <= and >= as a nested BinaryOperationNode
• [ ] Update parser tests to validate the new expected ast format

[alexdovzhanyn]

Turns out it was supported and I just missed it. Was fixed in this commit