Detect Binary Expressions etc. as dynamic values that can never be `null`ish.

StyleX now applies both inline styles for variables *and* the static classNames associated with dynamic styles conditionally.

This is done to account for cases where the dynamic value may end up being `null`ish.

However, there are certain expressions that are statically know to never be `null`ish. Detect these expressions and remove the ternary expressions that are used for the dynamic styles they're used for.

An incomplete list of known non-null expressions:

- Binary `+` expression
- Binary `-` expression
- Unary `+`/`-` expression
- Any kind of non-empty string literal, including template strings.