Release 1.4.0

• Bump to spring boot 2.3.3.RELEASE
• Bump to sshd 2.5.1
• Add method SshShellHelper#getSshEnvironment() to retrieve information about ssh environment
• Fixed start app failure in case of spring.main.lazy-initialization=true
• Fixed table rendering issue in SshShellHelper
• Add jmx commands :
  • jmx-list
  • jmx-info
  • jmx-invoke
• Add datasource commands
  • datasource-list
  • datasource-properties
  • datasource-query
  • datasource-update
• Add completion for post processors
• Rework commands properties (check configuration chapter)
  • default-commands becomes commands
  • Instead of just activation boolean, each command now has the following properties :
    • enable with default value set to true, except said otherwise in config
    • restricted with default value set to true, except said otherwise in config
    • authorizedRoles with default value initialized with ADMIN, except said otherwise in config
  • ssh.shell.actuator.* properties moved to ssh.shell.commands.actuator.*