Issue with context typing

Hey @rohit-ganguly I bumped into an issue today because of this typing:

interface AIChatCompletionOptions {
    context?: object;
    sessionState?: unknown;
}

Because of the object type, you can't index it on arbitrary property as TypeScript reports an error. Some linters like @typescript-eslint reports an error because of this type too.

The same issue also exists with the other context occurrences in AIChatCompletion, AIChatCompletionDelta, AIChatMessage, AIChatMessageDelta.

I recommend updating the type from object to Record<string, unknown> which solves the issues above. This is a common type used in TS for generic indexable objects.

Locate the definitions of AIChatCompletionOptions, AIChatCompletion, AIChatCompletionDelta, AIChatMessage, and AIChatMessageDelta, then inspect each context property. Update the context typing as described and run the project's TypeScript checks or linter to verify that arbitrary property access and the existing protocol types remain valid.