Implement dotnet tool command aliases

Add typed aliases and settings for dotnet tool subcommands, including install, list, restore, run, search, uninstall, update, and execute. Model command-specific options with dedicated settings classes, keep forwarded tool arguments as explicit ProcessArgumentBuilder parameters for execute/run, and add docs links for each alias.

Add unit coverage for command rendering, overloads, settings, forwarded arguments, validation, working directory behavior, and failure handling.

Author: paulomorgado