Refactor SimpleDmlParser to avoid unnecessary state variables and improve parsing efficient

The SimpleDmlParser seems to store a Table state variable which can likely be refactored and passed as arguments to the parser methods instead.

In addition, the SimpleDmlParser might could be reworked in such a way to take advantage of the the following code:
https://github.com/debezium/debezium-incubator/pull/185#discussion_r487996057