Add support for querying billing details #591
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Describe the change
This PR adds support for querying daily costs usage information (the same as shown on https://platform.openai.com/usage).
Describe your solution
The implementation uses the public endpoint available at https://api.openai.com/dashboard/billing/usage However, note that this API is not documented in https://platform.openai.com/docs/api-reference and thus this PR may be controversial to merge. The API requires a browser session key and will explicitly reject requests made using an API key.
Tests
I've added positive and negative unit tests in billing_test.go and mock the dashboard OpenAPI endpoint following the test pattern that is already established in chat_test.go.
Additional context
I'm using this feature in a CLI based gpt tool that I wrote which enables the user to query billing information from within the tool itself rather than switch to a web browser (https://github.com/mikeb26/gptcli/blob/main/cmd/gptcli/main.go#L272).