default to 4h for token expiration

[pelikhan]

• The defined constant AZURE_OPENAI_TOKEN_EXPIRATION has been added to constants.ts. It's value indicates a time period in milliseconds, specifically four hours. ⏳
• In azuretoken.ts, the createAzureToken function has been modified. Now it includes the AZURE_OPENAI_TOKEN_EXPIRATION constant as a part of return object.
  • Specifically, it's being utilized to decide the expiresOnTimestamp. If azureToken.expiresOnTimestamp is null, the expiresOnTimestamp is set to the current time plus four hours (coming from our newly defined constant). 📝💡
• Essentially, it appears the changes are concerned with implementing a set expiration time for Azure authentication tokens, and ensuring that this token expiry is maintained across the project. 🔄💼

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[github-actions]

The changes in the pull request seem to be mainly about handling token expiration for Azure.

The changes made in azuretoken.ts includes importing a new constant AZURE_OPENAI_TOKEN_EXPIRATION from the constants.ts file. This constant is then used as a fallback value for the expiresOnTimestamp field in the createAzureToken function in case azureToken.expiresOnTimestamp is not defined.

In constants.ts, a new constant AZURE_OPENAI_TOKEN_EXPIRATION is defined and set to 4 hours.

The changes look good as they add a layer of safety to the createAzureToken function by ensuring that expiresOnTimestamp will always have a value, and the value is configurable from constants.ts.

LGTM 🚀

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