💥 Implement Ternary Operator

[sudo rm -rf --no-preserve-root /]

In the new Vyper version 0.3.8, the ternary operator has been implemented (see here):

@external
def hello(a: uint256, b: uint256) -> uint256:
    return a if a < b else b

We should assess the full code base, where a ternary operator could be beneficial.