feat(compiler): Add equality ops [fixes LNG-217]

[InversionSpaces]

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[linear]

LNG-217 Add equality comparison operators

Add binary operators == and != for values of any type (same type)

== and != should have higher precedence than && and ||, but lower precedence than any other oparetor

Inline <left> == <right> to

<left-inline>
<right-inline>
(xor
  (match <left-res> <right-res> (ap true <res>))
  (ap false <res>)
)

(use mismatch for !=)