Added two methods (thanks to @FranGomezVenegas for requesting these, #608):

• FieldInfoList ClassInfo#getEnumConstants(): returns all the enum constants of an enum class as FieldInfo objects (without loading the enum class).
• List<Object> ClassInfo#getEnumConstantObjects(): returns all the enum constants of an enum class as objects of the same type as the enum (after loading the enum class and initializing enum constants).

Mitigate log4j2 vulnerability CVE-2021-44228: ClassGraph does not use log4j2, but does use the built-in Java logging framework, which may be redirected to the log4j2 framework by the calling environment. To be safe, ClassGraph now builds in a protection against this critical vulnerability.