add a running index to pandas partitioned by user id

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Given this dataset

CUSTOMER_ID,ORDER_AT
A,2020-11-11 23:30:13
A,2020-11-11 23:32:53
A,2020-11-11 23:34:44
A,2020-11-11 23:35:55
B,2020-11-11 23:37:54
B,2020-1


                      
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