refactor: rename StepDefinition.code to fn to be consistent with options

src/gen/testFile.ts

@@ -401,7 +401,7 @@ export class TestFile {
     // fixtures are accessible via this.world
     if (stepDefinition.isCucumberStyle()) return [];
 
-    return fixtureParameterNames(stepDefinition.code) // prettier-ignore
+    return fixtureParameterNames(stepDefinition.fn) // prettier-ignore
       .filter((name) => !isBddAutoInjectFixture(name));
   }
 

src/run/StepInvoker.ts

@@ -59,7 +59,7 @@ class StepInvoker {
       // some projects request it for better migration process from cucumber.
       // Here, for pw-style we pass empty object as world.
       // See: https://github.com/vitalets/playwright-bdd/issues/208
-      return stepDefinition.code.call(this.bddContext.world, fixturesArg, ...parameters);
+      return stepDefinition.fn.call(this.bddContext.world, fixturesArg, ...parameters);
     });
   }
 

src/steps/stepDefinition.ts

@@ -34,8 +34,7 @@ export class StepDefinition {
     return this.options.pattern;
   }
 
-  // todo: rename to fn to be consistent with options?
-  get code() {
+  get fn() {
     return this.options.fn;
   }