V.0.3.5.7 rewrite the overrides and add dynamic replacement

[njfio]

This commit introduces the ability to override specific config entries directly from the command line using the -o or --override flag. This provides
greater flexibility and control over workflow execution without modifying the config file.

Key changes:

- Adds -o/--override flag to the CLI, allowing users to specify key-value pairs for config overrides.
- Implements logic to parse and apply these overrides to the flow configuration before execution.
- Enhances Fig autocomplete script to suggest available config keys for overrides.
- Improves error handling and debugging messages related to config overrides.

This feature streamlines the workflow customization process, enabling users to quickly experiment with different settings and optimize workflow 
behavior.

┆Issue is synchronized with this Trello card by Unito