feat: Increase drain max depth from 8 -> 30

[benclive]

What this PR does / why we need it:
Main change is to bump the max log depth in Drain config to 30. This lets it find patterns in a wider variety of logs, and performs significantly better in some cases (systemd logs in particular).

The trade off here is that it tends to generate more patterns which will result in more memory usage. Improvements to resource usage will follow in more PRs.

Also a few small iterative improvements:

• Sort test output for stability
• Add benchmark to get a baseline for allocations etc.
• Add a test flag to generate test-friendly output to update the patterns in the test cases.

[cyriltovena]

LGTM