feat: add TermInfo for LVal
@Vtec234 Added the missing info.
Given
```lean
def f3 (s : Nat × Array (Array Nat)) : Array Nat :=
s.2[1].push s.1
```
We produce the following `InfoTree` for the body (originally at line 30)
```
Array.push (Array.getOp s.snd 1) s.fst : Array Nat @ ⟨30, 2⟩-⟨30, 17⟩
s : Nat × Array (Array Nat) @ ⟨30, 2⟩-⟨30, 3⟩
Prod.snd : {α β : Type} → α × β → β @ ⟨30, 4⟩-⟨30, 5⟩
Array.getOp : {α : Type} → [inst : Inhabited α] → Array α → Nat → α @ ⟨30, 5⟩-⟨30, 6⟩
1 : Nat @ ⟨30, 6⟩-⟨30, 7⟩
Array.push : {α : Type} → Array α → α → Array α @ ⟨30, 9⟩-⟨30, 13⟩
s.fst : Nat @ ⟨30, 14⟩-⟨30, 17⟩
s : Nat × Array (Array Nat) @ ⟨30, 14⟩-⟨30, 15⟩
Prod.fst : {α β : Type} → α × β → α @ ⟨30, 16⟩-⟨30, 17⟩
```
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