Tests 36:0
LogsEventMessageParser. Limited support for parenthesized strings in all parsers.

LogsEventMessageParser implemented supporting StreamName, GroupName,
Message, Timestamp.
Limited support for parenthesized strings in all parsers.
Test 46:0.
Logs pattern processing. Cleanup and debugging.
It gets deadlocked for short intervals. Stubbed LogDatumRenderer.
Implemented LogDatumRenderer.
Events weren't ordered, AWS complained.