Support exclusion strategy for classes to be skipped from serialization

[gpor0]

Javers supports registerIgnoredClass API to ignore specific class. It would be very useful in some cases to support ignoreStrategy / exclusionStrategy where implementor can define custom rule like ignoring by package or similar.

Gson already supports exclusion strategy but as far as i am aware of Gson configuration in Javers cannot be accessed at the moment.

[bartoszwalacik]

Makes sense, we will accept your PR if you like to contribute.

API sketch :

javersBuilder.registerIgnoredClassesStrategy(IgnoredClassesStrategy strategy)

interface IgnoredClassesStrategy {

    boolen isIgnored(Class<?> domainClass);

}