allow setting filter/include/exclude from the auth-proxy script

The associated forum post URL from https://forum.rclone.org

https://forum.rclone.org/t/filter-with-auth-proxy/35514/3

What is your current rclone version (output from rclone version)?

rclone v1.61.1
- os/version: linuxmint 19.3 (64 bit)
- os/kernel: 5.4.0-122-generic (x86_64)
- os/type: linux
- os/arch: amd64
- go/version: go1.19.4
- go/linking: static
- go/tags: none

What problem are you are trying to solve?

generating _root/filter/include/exclude dynamically from auth-proxy script

How do you think rclone should be changed to solve that?

rclone should be able to extract filter/exclude/include definitions from the json returned by the auth-proxy script, such as:

#!/usr/bin/env bash

cat <<__EOF__

{ "type": "local", "_root": "/", "include": ["data/**","backup/**"] }

__EOF__

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