Add query support to DynamoDBIO

DynamoDBIO currently only allows to do Scans supporting Querys should be a considerable cost improvement for users.
For ref.
https://stackoverflow.com/questions/43452219/what-is-the-difference-between-scan-and-query-in-dynamodb-when-use-scan-query

Imported from Jira [BEAM-7558](https://issues.apache.org/jira/browse/BEAM-7558). Original Jira may contain additional context.
Reported by: iemejia.

Start by locating the Java DynamoDBIO implementation and read how its current scan-only behavior is exposed. Use the linked DynamoDB Scan versus Query reference to understand the requested distinction, then identify the existing tests for DynamoDBIO. Done means DynamoDBIO supports the requested Query behavior while preserving existing scan support.

Written by the indexing model from the issue text.