Implement GPT Usage Cap

[ryanmio]

This PR implements a usage cap for GPT API calls. Here are the main changes:

• Added gptCalls and gptTokens fields to the user document in Firestore to track the number of API calls and tokens used by each user.
• After each OpenAI API call, the gptCalls and gptTokens fields are updated.
• Before each OpenAI API call, a check is performed to see if the user has exceeded their limit. If the limit is exceeded, an error message is returned and the API call is not made.
• Implemented a Cloud Function (resetUsageData) that resets the gptCalls and gptTokens counters daily.
• Updated Firestore Security Rules to prevent unauthorized access or manipulation of the gptCalls and gptTokens fields.
• Added gptCallsCap and gptTokensCap fields to the user document, and implemented a function (checkUsageData) that updates the capExceeded field when a user exceeds their cap.
• Added a real-time listener in the Home component that updates the capExceeded state whenever the capExceeded field in Firestore changes.
• Passed the capExceeded state to the ChatWithScript component and used it to disable the chat input and send button when the cap is exceeded.

These changes ensure that users cannot exceed a specified limit of GPT API usage, helping to control costs and prevent abuse.

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