### Summary

Add type hints to `ansible.parsing.dataloader::DataLoader`

### Issue Type

Feature Idea

### Component Name

lib/ansible/parsing/dataloader.py
self._vault.secrets = vault_secrets
    def load(self, data, file_name='<string>', show_content=True, json_only=False):
        '''Backwards compat for now'''
        return from_yaml(data, file_name, show_content, self._vault.secrets, json_only=json_only)
    def load_from_file(self, file_name, cache=True, unsafe=False, json_only=False):
        ''' Loads data from a file, which can contain either JSON or YAML.  '''
        file_name = self.path_dwim(file_name)
        display.debug("Loading data from %s" % file_name)
        
        
        if cache and file_name in self._FILE_CACHE:
            parsed_data = self._FILE_CACHE[file_name]
        else:
            
            (b_file_data, show_content) = self._get_file_contents(file_name)
            file_data = to_text(b_file_data, errors='surrogate_or_strict')
            parsed_data = self.load(data=file_data, file_name=file_name, show_content=show_content, json_only=json_only)
            
            self._FILE_CACHE[file_name] = parsed_data
        if unsafe:
            return parsed_data
        else:
            
            return copy.deepcopy(parsed_data)
    def path_exists(self, path):