Convert UNAV Logic to Run on Serverless

[surendhar-palanisamy]

Refactor the functions that map to the following endpoints:

• /settings
• /localize
• /planner

An empty class named UnavServer has been defined with empty methods localize and planner under src/modal_function/unav.py

• The /settings endpoint will not be used, as each method will run in a separate container. Therefore, we need to set the settings from the configuration file every time a container is spun up.

• When calling the localize and planner methods, pass the entire configuration file and the user-selected destination to the modal function methods.

• Ensure that settings are configured from the configuration file during container initialization while the Server class is being initialized in localize and planner method