feat(DynamicFetcher): add the ability to add init_script to context (#56)

scrapling/engines/_browsers/_validators.py

@@ -32,6 +32,7 @@ class PlaywrightConfig(Struct, kw_only=True, frozen=False):
     extra_headers: Optional[Dict[str, str]] = None
     useragent: Optional[str] = None
     timeout: int | float = 30000
+    init_script: Optional[str] = None
     disable_resources: bool = False
     wait_selector: Optional[str] = None
     cookies: Optional[List[Dict]] = None
@@ -58,6 +59,15 @@ class PlaywrightConfig(Struct, kw_only=True, frozen=False):
         if not self.selector_config:
             self.selector_config = {}
 
+        if self.init_script is not None:
+            script_path = Path(self.init_script)
+            if not script_path.exists():
+                raise ValueError("Init script path not found")
+            elif not script_path.is_file():
+                raise ValueError("Init script is not a file")
+            elif not script_path.is_absolute():
+                raise ValueError("Init script is not a absolute path")
+
     @staticmethod
     def __validate_cdp(cdp_url):
         try: