feat(generator): support output_dir and build_extensions config for generated files

Now the code generator supports specifying a custom output directory and extension/name template for generated DI files via build.yaml ( and ). This allows placing all generated code in custom folders and using flexible naming schemes.

docs: update all user docs and tutorials to explain new output_dir/build_extensions config

- Added detailed usage and YAML examples to cherrypick_generator/README.md
- Synced full_tutorial_en.md and full_tutorial_ru.md (advanced codegen section) with explanation of new configuration and impact on imports
- Updated quick_start_en.md and quick_start_ru.md to mention advanced customization and point to tutorials
- Added troubleshooting and tips for custom output/imports in docs

cherrypick_generator/build.yaml

@@ -1,20 +1,18 @@
 builders:
-  module_generator:
-    import: "package:cherrypick_generator/module_generator.dart"
-    builder_factories: ["moduleBuilder"]
-    build_extensions: {".dart": [".module.cherrypick.g.dart"]}
-    auto_apply: dependents
-    required_inputs: ["lib/**"]
-    runs_before: []
-    build_to: source
   inject_generator:
     import: "package:cherrypick_generator/inject_generator.dart"
     builder_factories: ["injectBuilder"]
     build_extensions: {".dart": [".inject.cherrypick.g.dart"]}
     auto_apply: dependents
-    required_inputs: ["lib/**"]
-    runs_before: []
     build_to: source
+    applies_builders: ["source_gen|combining_builder"]
+  module_generator:
+    import: "package:cherrypick_generator/module_generator.dart"
+    builder_factories: ["moduleBuilder"]
+    build_extensions: {".dart": [".module.cherrypick.g.dart"]}
+    auto_apply: dependents
+    build_to: source
+    applies_builders: ["source_gen|combining_builder"]
 
 targets:
   $default:
@@ -24,4 +22,4 @@ targets:
           - lib/**.dart
       cherrypick_generator|inject_generator:
         generate_for:
-          - lib/**.dart
+          - lib/**.dart