ai.infer: anthropic types and adapters (#762)

This add types from the Anthropic SDK to support Anthropic models.

---------

Co-authored-by: Jack Williams <1736957+jpwilliams@users.noreply.github.com>
Co-authored-by: Jack Williams <jack@inngest.com>

.changeset/twenty-buttons-retire.md

@@ -0,0 +1,5 @@
+---
+"inngest": minor
+---
+
+Add `anthropic()` model for `step.ai.*()`

packages/inngest/src/components/ai/adapter.ts

@@ -1,3 +1,4 @@
+import { type AnthropicAiAdapter } from "./adapters/anthropic.js";
 import { type OpenAiAiAdapter } from "./adapters/openai.js";
 
 /**
@@ -91,7 +92,7 @@ export namespace AiAdapter {
   /**
    * Supported I/O formats for AI models.
    */
-  export type Format = "openai-chat"; // | "anthropic" | "gemini" | "bedrock";
+  export type Format = "openai-chat" | "anthropic";
 
   /**
    * A function that creates a model that adheres to an existng AI adapter
@@ -108,6 +109,7 @@ export namespace AiAdapter {
  */
 const adapters = {
   "openai-chat": null as unknown as OpenAiAiAdapter,
+  anthropic: null as unknown as AnthropicAiAdapter,
 } satisfies Record<AiAdapter.Format, AiAdapter>;
 
 /**