feature: implement state capability

[pnadolny13]

No state is tracked as of today.

LastEvaluatedKey + ExclusiveStartKey

I'm not exactly sure how the LastEvaluatedKey attribute works but we already have to use it for paginating within a single scan

tap-dynamodb/tap_dynamodb/dynamo.py

Line 53 in 9e582d9

start_key = response.get("LastEvaluatedKey", None)

so it might work for incrementally reading across syncs.

https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Scan.html#DDB-Scan-request-ExclusiveStartKey

FilterExpression

A string that contains conditions that DynamoDB applies after the Scan operation, but before the data is returned to you. Items that do not satisfy the FilterExpression criteria are not returned.

https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Scan.html#DDB-Scan-request-FilterExpression

Stream based

Streams allow you to incrementally request stream data if it hasnt expired yet.
https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_streams_GetRecords.html. Depends on #6