when full singbox configuration is too much but single outbound json is not enought

[dimzon]

Description suggestions

Need ability to pass custom outbound-chains instead single outbound. It's possible to pass compete config json but it's overkill.

Necessity of recommendations

Need ability to pass JsonArray of outbounds. outbounds[0] will be final and detour to outbounds[1], outbounds[1] detour to outbounds[2] and so on...

• new schema: singboxoutbound://base64url_safe(jsonArray for chain or jsonObject for single outbound)#remarks