Add method to list indexes for one collection

[PPG007]

Sometimes I need to test index usage to make sure the index created is useful. In my work, there is a staging env running on public net, and we want to sync it's db indexes to local env, but I cannnot find a method in qmgo that can list all indexes in the same format when using the create method, so I want to write one. Do you have any advice? If you approve this feature, I will work on it.

@jiangz222