feat(memory): adds support for customizable memory interface

[thehapyone]

This PR adds support to be able to use custom memory/storage interface for the Crew. A use case for this if the user wants to use some totally different embedding model, or some custom setup aside from the one provided by embeddchain - This is one step in removing the hard dependency on the embeddchain library.

Here is a sample storage interface - https://github.com/thehapyone/Sage/blob/7b24cedcc4cc0f90ed5c15949a63f13e6e966b5c/sage/agent/memory.py#L46

Others:

• Address a previous failing test due to c055c35#diff-5ccf1187d87635b000d9364216215d7d04dace4197c62219b3d875920f4cff2cR85
• Address a type checker error due to - 2787c9b