Added

• Added bash function check to the install and health-check subcommands. The nrfutil completion system does not work without the bash-completions system being installed and sourced correctly. Now nrfutil completion install will check the for the _get_comp_words_by_ref bash function in a shell process launched with bash -i and error if it is not found.
• Added bash version check to the install and health-check subcommands. The nrfutil completion system does not work with bash version 3 which is the system version on MacOS. Now nrfutil completion install will check the $BASH_VERSION environment variable and warn if the major version is less than 5.
• Add --no-checks flag to install command to disable shell checks so that the user can get to the installation information regardless of the state of their shell.
• Added support for --changelog and --changelog-full flags. Where --changelog will print out the latest changelog entry corresponding to the current version and --changelog-full will print out the full changelog.