[Proposal] Extend the list of well known super classes

[ezanaga1]

When MemberCacheUtils.reflect() tries to access ZoneRegion.getId(), jvm prints:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.mitchellbosecke.pebble.attributes.MemberCacheUtils (pebble-3.1.2.jar) to method java.time.ZoneRegion.getId()
WARNING: Please consider reporting this to the maintainers of com.mitchellbosecke.pebble.attributes.MemberCacheUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

ZoneRegion is package-private but extends ZoneId which is public, and getId() is public too.

A list of well known super classes to avoid illegal reflective access could be added to PebbleEngine, in addition to those defined in MemberCacheUtils.reflect().

[ezanaga1]

Java 17 error:

java.lang.reflect.InaccessibleObjectException: Unable to make public java.lang.String java.time.ZoneRegion.getId() accessible: module java.base does not "opens java.time" to unnamed module @5034c75a