feat/cli: migrate version subcommand to use urface/cli

[burmudar]

This introduces a compatibility layer to start migrating src-cli to use a cli framework.

Some of the benefits we get by using a cli framework:

• consistent flag handling
• automatic help rendering of commands and flags
• automatic value set of flags based on env variables
• consistent handling of exit codes
• hooks - like to make sure we have loaded the configuration before a command starts execution

If a command is within the migrated set, we then defer to executing the command within urfave/cli with runMigrated. If the command is not in the set we executing the legacy code with runLegacy.

Test plan

Tested locally