develop the process to store function_schemas in the vectorDB during the initialization of route_layer

develop the process of storing the function_schemas field for the route_layer add function on Pinecone

This reverts commit 7597bc35.

The former is only supported from Python 3.10 onwards and we'd like to support Python 3.9 onwards.

Mostly just trying to make MyPy happy!

Rather than is_index_populated.

Also fixed bug in layer.py where we weren't:
a) Setting the index_name to a default value.
b) Weren't using index_name.

Also made sure it's used properly in layer.py.