Define AI GRPC service to support using AI to generate cells (#573)

We'd like to use AI to generate cells. In particular, we'd like to
support using [Foyle](foyle.io) to add AI capabilities.

The initial plan is to use a gRPC service to allow RunMe to communicate
with Foyle (or potentially other AI services). This proto needs to
define that gRPC service.

pkg/api/gen/proto/ts/runme/ai/v1alpha1/ai_pb.client.d.ts

@@ -0,0 +1,42 @@
+/* eslint-disable */
+// @generated by protobuf-ts 2.9.4 with parameter output_javascript,optimize_code_size,long_type_string,add_pb_suffix,ts_nocheck,eslint_disable
+// @generated from protobuf file "runme/ai/v1alpha1/ai.proto" (package "runme.ai.v1alpha1", syntax proto3)
+// tslint:disable
+// @ts-nocheck
+import type { RpcTransport } from "@protobuf-ts/runtime-rpc";
+import type { ServiceInfo } from "@protobuf-ts/runtime-rpc";
+import type { GenerateCellsResponse } from "./ai_pb";
+import type { GenerateCellsRequest } from "./ai_pb";
+import type { UnaryCall } from "@protobuf-ts/runtime-rpc";
+import type { RpcOptions } from "@protobuf-ts/runtime-rpc";
+/**
+ * The AIService service is used to provide assistant capabilities to Runme.
+ *
+ * @generated from protobuf service runme.ai.v1alpha1.AIService
+ */
+export interface IAIServiceClient {
+    /**
+     * GenerateCells uses the AI to generate cells to insert into the notebook.
+     *
+     * @generated from protobuf rpc: GenerateCells(runme.ai.v1alpha1.GenerateCellsRequest) returns (runme.ai.v1alpha1.GenerateCellsResponse);
+     */
+    generateCells(input: GenerateCellsRequest, options?: RpcOptions): UnaryCall<GenerateCellsRequest, GenerateCellsResponse>;
+}
+/**
+ * The AIService service is used to provide assistant capabilities to Runme.
+ *
+ * @generated from protobuf service runme.ai.v1alpha1.AIService
+ */
+export declare class AIServiceClient implements IAIServiceClient, ServiceInfo {
+    private readonly _transport;
+    typeName: any;
+    methods: any;
+    options: any;
+    constructor(_transport: RpcTransport);
+    /**
+     * GenerateCells uses the AI to generate cells to insert into the notebook.
+     *
+     * @generated from protobuf rpc: GenerateCells(runme.ai.v1alpha1.GenerateCellsRequest) returns (runme.ai.v1alpha1.GenerateCellsResponse);
+     */
+    generateCells(input: GenerateCellsRequest, options?: RpcOptions): UnaryCall<GenerateCellsRequest, GenerateCellsResponse>;
+}