Add simple cache for model

[granttnarg]

What does this do?

Brief description of the changes.

Specific changes

• Add simple in memory cache for our model
• Add Baseline Model as a comparison to our fine-tuned model
• Extend logs to track our 2 models comparison
• Add Rate Limit to ENV Variable

Notes / Testing

Extend tests for new features

Note new ENVs needed for production setup
BASE_WANDB_ORG=""
BASE_WANDB_PROJECT=""
BASE_WANDB_MODEL_NAME=""
BASE_WANDB_MODEL_VERSION=""
RATELIMIT_PER_MIN=""