* Make it possible to use InstrumentationContext (now VirtualField) from library instrumentation
* fix tests
* fix javadocs
* fix some more tests
* code review comments
* setIfNull, computeIfNull
* Refactor TypeInstrumentation#transformers() method part 1
Add TypeInstrumentation and its implementations
* Refactor TypeInstrumentation#transformers() method part 2
Use the new method in all existing TypeInstrumentation implementations
* Drift
* Spotless
Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>