Allow Agent instance to supply custom OAuth provider.

[jaredhanson]

I am implementing agents that use alternative ways to register and authenticate with OAuth authorization servers. These mechanisms are based on early draft OAuth specifications, and will hopefully see more widespread adoption as MCP's use of OAuth matures beyond dynamic client registration (which has many downsides).

To facilitate this, supplying a different AgentsOAuthProvider is necessary. This pull request proposes a createOAuthProvider function on the Agent class, which by default returns the current DurableObjectOAuthClientProvider instance. This function can be overridden by Agent subclasses that need to use an alternative implementation.

An example of a agent that has a custom OAuth provider is as follows:

export class MyChatAgent extends AIChatAgent<Env> {
   // ...

   createOAuthProvider(callbackUrl: string): AgentsOAuthProvider {
      return new MyCustomOAuthProvider(
        this.ctx.storage,
        this.name,
        callbackUrl
      );
   }
}

Let me know if I can supply any additional details. Any and all feedback is welcome! Thanks!

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