- only enable if 'enable_auto_resize' is true, default to false
- if true, set memory limit to 1.2 of memory requests, resize when
hitting 'soft oom' of initial request, adjust by 1.2 (current behavior)
up to max_crawler_memory
- if false, set memory limit to max_crawler_memory and never adjust
memory requests or memory limits
- part of #1959