Add Alias parameter or some more predictable pattern to function names

I have a pure lambda defined in my app that I would like another function to invoke conditionally
```
@app.lambda_function(name=NAME)
def some_func(payload_s: str, context: Any)
```

But when I go to invoke it, of course, I can't reliably find it, because the name has added a bunch of chalice stuff to it
`app-name-NAME-1C4XDPDWAKN3I`

Is there a way I dont know of to make this name easy to find? if not how could I go about aliasing this function? Would that be a new feature?

Start by reading how Chalice currently derives names for functions declared with app.lambda_function(name=NAME), then review the AWS Lambda naming and alias behavior relevant to invocation. Done means the issue has a predictable way to find or alias the deployed function, with the behavior covered by tests or documented usage.

Written by the indexing model from the issue text.