## 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.
"""Get details for a single function
    ---
    operationId: 'getFunction'
    parameters:
        - name: 'request'
          in: body
        - name: 'function'
          in: path
    """
    region = LambdaRegion.get()
    funcs = do_list_functions()
    arn_regex = r".*%s($|:.+)" % function
    is_arn = ":" in function
    for func in funcs:
        if function == func["FunctionName"] or (
            is_arn and re.match(arn_regex, func["FunctionArn"])
        ):
            return lookup_function(func, region, request.url)
    return not_found_error(func_arn(function))
@app.route("%s/functions/" % API_PATH_ROOT, methods=["GET"])
def list_functions():