Add the new command to install a language runtime

[Angelmmiguel]

With the addition of this feature, we plan to add a new command for wws. Currently, it doesn't include any command as it assumes a default "run" command.

This issue will include a new command which it's still under discussion. We're thinking on a runtimes command and several subcommands like install, uninstall, etc.

Regarding the main command, we still want wws to behave the way it works now. So, we don't plan to add an explicit run command at this point.

Required commands

• Install a new runtime
• Uninstall a runtime
• List installed runtimes
• Check local installation

Parameters

These commands will include a parameter to refer to a specific runtime metadata file.