Improvements for Dump paper commands

[Doc94]

This PR make a few improvements in the dump commands added in Paper.

• dumplisteners
  • improvements in messages
  • use same logic for log error when failed to create file like dumpplugins
  • add copy-to-clipboard for copy the path of directory/files created
  • replace the use of deprecated setLenient in favor of the new stricness
  • change the extension of generated file to JSON
• dumpplugins
  • improvements in messages
  • handle a possible error not catched if the directory cannot be created
  • add copy-to-clipboard for copy the path of directory/files created

not sure why IntelliJ dont really like the nullable annotations used from checkerframework