feat: add CLI Version to default output

[flawidjuego]

Running njs2 will now output:

CLI Version: 2.0.0-beta.1

njs2 project <project-name>
njs2 endpoint <endpoint-name>
njs2 run serverless
njs2 run express
njs2 run nodemon
njs2 plugin-local <plugin-name> <plugin-project-path>
njs2 plugin <plugin-name>
njs2 plugin uninstall <plugin-name>
njs2 plugin compile
njs2 plugin install <plugin-name>
njs2 library <folder-name> <filename> <options : [sql,mongo]>
njs2 upgrade [version] [version-number]

Instead of:

njs2 project <project-name>
njs2 endpoint <endpoint-name>
njs2 run serverless
njs2 run express
njs2 run nodemon
njs2 plugin-local <plugin-name> <plugin-project-path>
njs2 plugin <plugin-name>
njs2 plugin uninstall <plugin-name>
njs2 plugin compile
njs2 plugin install <plugin-name>
njs2 library <folder-name> <filename> <options : [sql,mongo]>
njs2 upgrade [version] [version-number]

This way we can know the version of the CLI we're running on.