Add support for CRaC

[scottgerring]

Is your feature request related to a problem? Please describe.
We should add support for CRaC priming. This will improve the startup performance of applications using Powertools. @msailes has written a helpful guide here. I think we should do this before v2 is released.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[subhash686]

@scottgerring I would like to take a CRaCk at this :)
Given this is an enhancement, should I create any additional documentation before starting? Also what is a potential v2 release date that I can work backwards from?

Describe the solution you'd like
Automatic priming of sub-modules independently helps the run time snapshot only what is required.
Try to create a list of classes at build time before packaging (Need to research this a little, but we can definitely start with a manual step of generating such a list)
Preload the identified classes using CRaC

Describe alternatives you've considered
Manual priming may be simpler but we need to decide good code-paths to hint JIT. These are subjective and need maintenance when things change.

Additional context
@msailes blog and examples from embedded metrics