Update rate limits

[trentfowlercohere]

This PR introduces changes to the rate limits for Cohere's API keys, specifically the trial and production keys. The modifications include:

• Renaming the 'Evaluation rate limit' to 'Trial rate limit' to align with the new terminology.
• Updating the rate limits for various endpoints, such as reducing the rate limit for the 'Embed' endpoint from 100,000/min to 100/min for trial keys and introducing a limit of 2,000/min for production keys.
• Adding new endpoints like 'Tokenize' and 'Classify' with specific rate limits.
• Implementing a monthly limit of 1,000 calls for all endpoints with a trial key.
• Providing contact information for rate limit increase inquiries.

Changes:

• The 'Evaluation' key is now referred to as a 'Trial' key, reflecting a change in terminology.
• Rate limits for specific endpoints have been adjusted, with notable changes including the 'Embed' endpoint's limit reduction from 100,000/min to 100/min for trial keys and the introduction of a 2,000/min limit for production keys.
• New endpoints, 'Tokenize' and 'Classify', have been added with their respective rate limits.
• A monthly limit of 1,000 calls has been set for all endpoints when using a trial key.
• Contact information ([email protected]) is provided for users seeking rate limit increases.

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