feat: common Azure service bindings

[zpg6]

Adds ability to configure a database, cache, or other relevant Azure service as "bound" to your function.

1) Declare in your azure.config.json below your other app configuration

{
    "bindings": {
        "DB": {
            "type": "cosmos-sql",
            "databaseName": "mydb",
            "throughput": 400
        },
        "CACHE": {
            "type": "redis",
            "sku": "Basic",
            "capacity": 0
        }
    }
}

2) Easy typesafe access to your bindings (CosmosClient, ServiceBusClient, etc)

// app/api/users/route.ts
import { getBinding } from "opennextjs-azure/bindings";

export async function GET() {
    const db = getBinding<"cosmos-sql">("DB");

    const database = db.database("mydb");
    const container = database.container("users");
    const { resources } = await container.items.readAll().fetchAll();

    return Response.json(resources);
}

Environment variables "bound" to the function app are handled with the others in the bicep, as well as provisioning the resources in the app's resource group. Bicep file is programmatically modified at deploy-time with these added specifics.