Hypothesis phase settings

Overview

Expose hypothesis phase settings via the config file and (maybe) disable shrinking by default.

Specification

Add the following values to the default configuration.

hypothesis:
  phases:
    explicit: true
    reuse: true
    generate: true
    target: true
    shrink: false

There is a slight complexity here because this deviates from how hypothesis handles this setting natively. But we have to build the enum regardless, so this feels like a good approach imo.

re: disabling shrinking by default - this is the reason I need this setting exposed. As soon as shrinking begins, the max_examples value is now ignored… if you’re using sufficiently complex strategies or a state machine, the process can be very slow. There is definitely a value in producing a minimal example, but given the environment we’re using hypothesis in I’m not sure if this behavior is more often good or harmful. cc @fubuloubu - any thoughts?

[fubuloubu]

I meant more to explore the logic of similar shrinking strategies (like strings) and try to adapt it so it’s fast to shrink

[fubuloubu]

It’d probably make more sense to do a CLI flag in that case