extend input bindings with binding expressions to wire up related output bindings

Azure Functions has this notion of [binding expressions](https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-expressions-patterns) which allows to wire up input bindings (in Azure Functions terminology) with a trigger binding.

C# Sample: Correlation Id or queue message is used to lookup document (large message payload) from Blob Storage:

```
[FunctionName(nameof(DistributeInvoice))]
public static void DistributeInvoice(
[ServiceBusTrigger(
"invoice-queue",
Connection = "sbConnection")] Microsoft.Azure.ServiceBus.Message messageHeader,
[Blob(
"payloads/invoice/{correlationId}",
FileAccess.Read,
Connection = "payloadStorage")] string payloadIn,
ILogger log,
ExecutionContext context)
{
```

No files, tests, or entry points are named in the issue. Start by locating the component and binding documentation relevant to input and trigger bindings; done means supporting Azure Functions-style expressions that connect a trigger to an input binding, including the correlation-id/blob-storage example.

Written by the indexing model from the issue text.