Split chunks if their queries time out

[vcschapp]

User Story

As an application developer, I want increased confidence that I'm getting all available results from Insights even when my queries process so much data that they time out.

Notes

1. This feature would build on the existing splitting added in issue Split chunks when max result limit is reached #3. Instead of only being able to split when we get MaxLimit results, we also split when we get a timeout error back from CWL Insights on a GetQueryResults poll.
2. Part of this feature should include allowing arbitrary client-side timeouts for chunks. The current CWL timeout is 15m, which is a very long time to run to get feedback of this nature. When running a Query, customers may want to set lower timeouts so they can split faster and have some hope of quickly whittling oversize time ranges to achievable levels.

Open Questions

1. Add a new field into QuerySpec to request this, or just do it automatically when splitting due to result count is enabled?