## Problem
Currently, even if `LAMBDA_REMOTE_DOCKER=1`, we unzip the zip files in the directory they are in, which is usually /var/lib/localstack, which usually has a bind mount to the host.
On docker desktop, due to the use of grpc-FUSE (on macos), this can be very slow, about 200 times slower than on volumes / directly on the host. With experimental virtio filesystem enabled (also on macos), this can be reduced to about 30 times as slow, but still problematic.
This means a lambda may take a lot of time processing, for each additional layer some more. This especially affects nodejs lambdas with huge node_modules folders.

## Probable solution
At least if `LAMBDA_REMOTE_DOCKER=1`, we should leave the initial zip files on the bind mount (for persistence etc), but the working directories after unzipping should be located on non-bind mounts, to speed up the IO for unzipping.
"DestinationConfig": {
                "OnSuccess": {"Destination": str(response.on_successful_invocation)},
                "OnFailure": {"Destination": str(response.on_failed_invocation)},
            },
        }
    )
@app.route("/2019-09-25/functions/<function>/event-invoke-config", methods=["GET"])
def get_function_event_invoke_config(function):
    """Retrieves the configuration for asynchronous invocation for a function
    ---
    operationId: GetFunctionEventInvokeConfig
    parameters:
        - name: 'function'
          in: path
        - name: 'qualifier'
          in: path
        - name: 'request'
          in: body
    """
    region = LambdaRegion.get()
    try:
        function_arn = func_arn(function)
        lambda_obj = region.lambdas[function_arn]
    except Exception:
        return not_found_error("Unable to find Lambda function ARN %s" % function_arn)
    response = lambda_obj.get_function_event_invoke_config()
    if not response:
        msg = "The function %s doesn't have an EventInvokeConfig" % function_arn
        return not_found_error(msg)
    return jsonify(response)