GROQ Fix equality between non-literals

[saiichihashimoto]

Anything that resolves to non-literal number==number ends up returning true, where it should return boolean. I think it should go:

• If they're both literals, return true or false based on if they're equal
• If one of them is non-literal but they're the same type, return boolean
• If they're different types, return false
• Return the inverse for !=