HV-1226 Explore usage of method handles instead of core reflection in ReflectionHelper#getValue()

[marko-bekhta]

• https://hibernate.atlassian.net/browse/HV-1226

This PR is an attempt to allow users to switch between method handles and reflection when accessing properties.

EDIT: And as usual in such cases - some numbers: method handles:

# Run complete. Total time: 00:00:37
Benchmark                                   Mode  Cnt     Score     Error   Units
SimpleValidation.testSimpleBeanValidation  thrpt   20  2862.591 ± 195.745  ops/ms

reflection:

# Run complete. Total time: 00:00:37
Benchmark                                   Mode  Cnt     Score    Error   Units
SimpleValidation.testSimpleBeanValidation  thrpt   20  2739.682 ± 60.490  ops/ms

[gsmet]

OK, for now, let's give up on MethodHandles. (Just so that you don't waste time rebasing this)