[feature request] asts reserveOrdinals support range type

[chrisliu1995]

What would you like to be added:

spec.reserveOrdinals of asts support to specify ID list to reserve now. I suggest to support range type to avoid filling in too much number, which will make the yaml hard to check and add new IDs when ID is getting more.

For example, when users want to reserve list [1,2,3,4,5,6,7], if supporting range type, it will be [1 -> 7], much easier.