refactor: consider using the Scan paginator instead of custom logic

[pnadolny13]

I think this would eliminate much of the while loop in

tap-dynamodb/tap_dynamodb/dynamodb_connector.py

Line 63 in b159f2d

def get_items_iter(

.

• https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb/paginator/Scan.html
• https://boto3.amazonaws.com/v1/documentation/api/latest/guide/paginators.html