Support Int/Float operators in guard expressions

[rawhat]

Closes #90

[lpil]

Yooo that was fast! Thank you

@gleam-lang/tree-sitter-team this look good to you?

[the-mikedavis]

Just one thing about precedence, otherwise this looks good 👍

[the-mikedavis]

Suggested change

	binaryExpr(prec.left, 5, "*", $._case_clause_guard_expression),
	binaryExpr(prec.left, 5, "*.", $._case_clause_guard_expression),
	binaryExpr(prec.left, 5, "/", $._case_clause_guard_expression),
	binaryExpr(prec.left, 5, "/.", $._case_clause_guard_expression)
	binaryExpr(prec.left, 6, "*", $._case_clause_guard_expression),
	binaryExpr(prec.left, 6, "*.", $._case_clause_guard_expression),
	binaryExpr(prec.left, 6, "/", $._case_clause_guard_expression),
	binaryExpr(prec.left, 6, "/.", $._case_clause_guard_expression)

I believe we want these higher than the +/-/etc. ones so that the expressions associate properly. For example if you add a branch to one of the cases in the test file

case value {
  n if n + 1 * 2 > 5 -> False
}

without the change it would be (n + 1) * 2 but it should associate as n + (1 * 2)

[rawhat]

🤦🏻‍♂️ whoops, thanks

[the-mikedavis]

Thanks!