Allow Override of Configuration Parameters in AutoQueryEngine.from_config()

[SeeknnDestroy]

a feature enhancement for the AutoQueryEngine.from_config() method. The goal is to introduce the ability to override specific configuration parameters programmatically, even when primarily using a YAML configuration file.

Current Behavior:
Currently, AutoQueryEngine.from_config() initializes an engine entirely based on the settings defined in a YAML file. This is a user-friendly approach but can be limiting in scenarios where dynamic adjustments to the configuration are needed.

Proposed Enhancement:
Modify AutoQueryEngine.from_config() to accept an additional optional dictionary parameter named overrides. This dictionary will contain key-value pairs corresponding to the settings that need to be overridden in the YAML configuration.

Example Method Signature:

@staticmethod
def from_config(
    config_file_path: str,
    env_file_path: str = None,
    documents: Sequence[Document] = None,
    nodes: Optional[Sequence[BaseNode]] = None,
    overrides: dict = None) -> BaseQueryEngine:
    # method implementation

Benefits:

• Allows dynamic customization of configuration without altering the YAML file.
• Enhances flexibility, especially in scenarios where different settings might be required based on runtime conditions.
• Maintains backward compatibility; if no overrides are provided, the method functions as it currently does.

Use Case:
This feature will be particularly useful in scenarios where the majority of the configuration remains constant, but certain parameters (like embed_model or llm_model) need to be adjusted dynamically based on specific conditions or inputs.