Stricter all-args constructor search for POJOs

[nvamelichev]

Remove deprecated logic for all-args constructor detection in POJOs. It currently relies on Class.getDeclaredFields() being in a predictable order and matching that order with a constructor (which is an absolute madness, which surprisingly somewhat works for both Lombok and Kotlin classes)

[nvamelichev]

Initially released as opt-in in 2.7.2.

We'll test drive the new strict POJO search strategy implementation and switch to it exclusively if it proves to be low-risk and fail-fast in practice.