feat: include method arity in missing method runtime error messages

Add helper functions `canonicalSymbol` and `methodArgumentsString` to extract and format the argument count from symbol names. Update the runtime error message in `runInterpreter` to append the arity (e.g., "with 0 arguments", "with 2 arguments", "with 1 argument") when a class does not implement a method. Add new test cases for missing methods with one, two, and eleven arguments, and update all existing test expectations to include the arity suffix.

test/fiber/error.wren

@@ -3,5 +3,5 @@ var fiber = new Fiber {
 }
 
 IO.print(fiber.error) // expect: null
-IO.print(fiber.try)   // expect: String does not implement method 'unknown'.
-IO.print(fiber.error) // expect: String does not implement method 'unknown'.
+IO.print(fiber.try)   // expect: String does not implement method 'unknown' with 0 arguments.
+IO.print(fiber.error) // expect: String does not implement method 'unknown' with 0 arguments.

test/fiber/try.wren

@@ -6,5 +6,5 @@ var fiber = new Fiber {
 
 IO.print(fiber.try)
 // expect: before
-// expect: Bool does not implement method 'unknownMethod'.
+// expect: Bool does not implement method 'unknownMethod' with 0 arguments.
 IO.print("after try") // expect: after try