Jackson 3 support

[pjfanning]

Some Work In Progress is in a 'jackson-3' branch.

[pjfanning]

@cowtowncoder what is the Jackson 3 equivalent of setTypeFactory? The project README examples are based around replacing an ObjectMapper's TypeFactory with one that has its cache replaced.

[cowtowncoder]

@pjfanning If we are talking about ObjectMapper, it is immutable so replacement would need to be done during building phase. Method in MapperBuilder would be typeFactory(f). Access to builder is bit hidden, but it is via getOwner() method of setup context (Module.SetupContext) accessible during setupModule() call.

I wish I had time to work on cache-configurability part(s), as this would fall under that category. Still would need to (re)configure during building but would be sort of simpler, more standard, and avoid whole-sale replacement of TypeFactory -- and because of that would be cleanly exposed via Module.SetupContext.

But for immediate future this should work; please let me know if I missed some piece.

[mof-dev-3]

It seems we could reuse a single CaffeineLookupCache for multiple ObjectMappers, even if they have different configurations, provided they share some workloads (classes/types).