Add level control and logger level control of Solon logging plug-in

People in need can write down

solon.logging.appender:  console:    level: TRACE # Set level , The default is  TRACE    enable: true # Is it enabled? , The default is  true  cloud:    level: INFO # Set level , The default is  INFo    enable: true # Is it enabled? , The default is  true  file:    class: org.xxx.xxx.LogFileAppender # Custom adder class （ Not usually used ）    level: INFO # Set level solon.logging.logger:  "org.apache.zookeeper.*": # Package name selection     level: "WARN"  # Set level   "org.eclipse.jetty.*":    level: "WARN"