Add --help flag to tofuenv commands

[anastasiiakozlova245]

Is your feature request related to a problem? Please describe. Now only tofuenv --help command returns valid output with the explanation of possible commands. tofuenv install --help command returns: `No versions matching '--help' found in remote'.

Describe the solution you'd like tofuenv install --help and other tofuenv commands return valid explanation when --help flag is passed.

Describe alternatives you've considered

Additional context