fix(cloudflare/workers): support workflow env bindings

[jonbeckman]

Allow Worker env to accept Cloudflare Workflow resources and named Worker entrypoint service bindings directly.

env: {
  WORKFLOW: workflow,
  WORKFLOW_ACTIONS: {
    BindingType: "Cloudflare.WorkerEntrypointBinding",
    service: worker.workerName,
    entrypoint: "WorkflowActions",
  },
}

• Convert WorkflowResource values into workflow bindings.
• Convert WorkerEntrypointBinding values into service bindings with entrypoint.
• Map InferEnv to runtime Workflow and RPC service-binding types.