Allow to use getters and setters without get- or set- prefix to serialize/deserialize DB data, 2nd attempt

[alexvas]

First attempt with comments is here.

This branch contains:

• two small fixes:

1. static method could not be getter or setter
2. fixed a corner case of write-only property reflection with setter inherited using generics

• a small change: Reflector is final, so it is not possible to define custom reflection in the client code
• a feature that anything getting and setting goes (single-Reflector implementation)

I see three implied regressions here:

1. static getters or setters will stop working
2. custom Reflectors stop working
3. when a few setters with single argument of different types found for a write-only property, MyBatis will silently skip the property instead of bailing out.

The latter worries me the most. Should Reflector write some log information in this case?

[alexvas]

Closing and reopening request to restart CI check