MystenLabs/suiup

AI Summary: Enhance the `suiup install` command to provide more informative error messages when a specified version doesn't exist for a given network. The improvement should identify available versions and guide the user to the correct installation command.

AI Summary: Enhance the `suiup` tool to allow switching between different nightly versions of the same binary. Currently, multiple nightly builds can be installed, but switching between them is not supported. The task involves modifying the `suiup` codebase to manage and switch between these different nightly versions, potentially requiring updates to the command-line interface and internal data structures.