[Improvement] Allow bus opearator to create multiple favorite list

[chuasweechin]

Requested by Grab ops team.

Currently Grab ops team manages 120+ routes on a daily basis. They have plans to go up to 150 routes.
They wish to create multiple favorite list that allow that to focus on at different part of the day.

The current list of route on monitoring tool is too long for them and it is not salable for the ops.

@artylope added Yixin for design input