KCL: Comparison operators (#4025)

Add `==, !=, >, >=, <, <=` to the language parser, executor and tests.

Closes https://github.com/KittyCAD/modeling-app/issues/4020

Currently these comparison operators are associative, allowing users to chain them, e.g. (x <= y <= z). This should not be allowed, will do in a follow-up. See https://github.com/KittyCAD/modeling-app/issues/4155

src/wasm-lib/tests/executor/inputs/no_visuals/comparisons.kcl

@@ -0,0 +1,13 @@
+assert(3 == 3, "equality")
+assert(3.0 == 3.0, "equality of floats")
+assert(3 != 4, "non-equality")
+assert(3.0 != 4.0, "non-equality of floats")
+assert(3 < 4, "lt")
+assert(3 <= 4, "lte but actually lt")
+assert(4 <= 4, "lte but actually eq")
+assert(4 > 3, "gt")
+assert(4 >= 3, "gte but actually gt")
+assert(3 >= 3, "gte but actually eq")
+
+assert(0.0 == 0.0, "equality of zero")
+assert(0.0 == -0.0, "equality of zero and neg zero")

src/wasm-lib/tests/executor/inputs/no_visuals/comparisons_multiple.kcl

@@ -0,0 +1 @@
+assert(3 == 3 == 3, "this should not compile")

src/wasm-lib/tests/executor/no_visuals.rs

@@ -57,6 +57,7 @@ async fn run_fail(code: &str) -> KclError {
 
 gen_test!(property_of_object);
 gen_test!(index_of_array);
+gen_test!(comparisons);
 gen_test_fail!(
     invalid_index_str,
     "semantic: Only integers >= 0 can be used as the index of an array, but you're using a string"
@@ -99,4 +100,5 @@ gen_test!(if_else);
 //     if_else_no_expr,
 //     "syntax: blocks inside an if/else expression must end in an expression"
 // );
+gen_test_fail!(comparisons_multiple, "syntax: Invalid number: true");
 gen_test!(add_lots);