Add AGPL option to comply to Redis Open Source strategy

[al-rigazzi]

As this project was discontinued by Redis ltd, would it be possible to switch to a more permissive license? The community still sees value in this project, and releasing it for non-profit uses would be appreciated.

[al-rigazzi]

Please consider moving to AGPL for this module, as it was chosen for Redis 8.

[al-rigazzi]

@DvirDukhan I see you've done this for the VectorSimilarity project, do you think it can be done for this one?