feat(robotcode): Automatically create .gitignore in .robotcode_cache

You no longer need to manually add `.robotcode_cache` to your `.gitignore` file, as it is now automatically ignored.
If you already have an existing `.robotcode_cache` folder, simply run the command `RobotCode: Clear Cache and Restart Language Servers`.
For IntelliJ-based platforms, you can find this command in the **RobotCode** menu under the **Tools** main menu.

Closes #384

Author: d-biehl

packages/robot/src/robotcode/robot/diagnostics/data_cache.py

@@ -27,10 +27,20 @@ def read_cache_data(
     def save_cache_data(self, section: CacheSection, entry_name: str, data: Any) -> None: ...
 
 
-class JsonDataCache(DataCache):
+class FileCacheDataBase(DataCache, ABC):
     def __init__(self, cache_dir: Path) -> None:
         self.cache_dir = cache_dir
 
+        if not Path.exists(self.cache_dir):
+            Path.mkdir(self.cache_dir, parents=True)
+            Path(self.cache_dir / ".gitignore").write_text(
+                "# Created by robotcode\n*\n",
+                "utf-8",
+            )
+
+
+class JsonDataCache(FileCacheDataBase):
+
     def build_cache_data_filename(self, section: CacheSection, entry_name: str) -> Path:
         return self.cache_dir / section.value / (entry_name + ".json")
 
@@ -51,10 +61,7 @@ def save_cache_data(self, section: CacheSection, entry_name: str, data: Any) ->
         cached_file.write_text(as_json(data), "utf-8")
 
 
-class PickleDataCache(DataCache):
-    def __init__(self, cache_dir: Path) -> None:
-        self.cache_dir = cache_dir
-
+class PickleDataCache(FileCacheDataBase):
     def build_cache_data_filename(self, section: CacheSection, entry_name: str) -> Path:
         return self.cache_dir / section.value / (entry_name + ".pkl")
 

packages/robot/src/robotcode/robot/diagnostics/imports_manager.py

@@ -610,7 +610,8 @@ def get_namespace_for_resource(self, document: TextDocument) -> "Namespace":
 
     def clear_cache(self) -> None:
         if self.cache_path.exists():
-            shutil.rmtree(self.cache_path)
+            shutil.rmtree(self.cache_path, ignore_errors=True)
+
             self._logger.debug(lambda: f"Cleared cache {self.cache_path}")
 
     @_logger.call