- expose isDisableInheritableForThreadPool/isEnableTimerTask
- improve test for DisableInheritableForThreadPool

disable Inheritable feature by using InheritableThreadLocal
can avoid potential leaking problem described in #100

- add DisableInheritableThreadFactory wrapper in TtlExecutors
- add Inheritable unit test

- use CtClass.getDeclaredMethod(String, CtClass[])
  instead of CtClass.getDeclaredMethod(String)
- javadoc of CtClass.getDeclaredMethod(String):
  If there are multiple methods with the specified name,
  then this method returns one of them.

- add contributor @xwshiustc

timestamp INFO [thread name] class-name: message info

java agent start and process when app boot,
it is difficult to use (java.util.logging)JUL correctly 😩;
especially cooperate with app server(eg tomcat or jboss).

use simply std out/error instead of JUL.

more info see #97