Kwargs: assert functions (#6406)

Closes https://github.com/KittyCAD/modeling-app/issues/6408

rust/kcl-lib/tests/comparisons_multiple/execution_error.snap

@@ -1,12 +1,12 @@
 ---
-source: kcl/src/simulation_tests.rs
+source: kcl-lib/src/simulation_tests.rs
 description: Error from executing comparisons_multiple.kcl
 ---
 KCL Semantic error
 
   × semantic: Expected a number, but found a boolean (true/false value)
    ╭────
- 1 │ assert(3 == 3 == 3, "this should not compile")
+ 1 │ assert(3 == 3 == 3, error = "this should not compile")
    ·        ───┬──
    ·           ╰── tests/comparisons_multiple/input.kcl
    ╰────