Provide a way to search the various command names and help text via the builtin help command.

As a cli tool grows in capabilities and complexity it becomes harder and hard to find out which command, subcommand, or option might be helpful to accomplish a task.

As one idea to help solve this, we could introduce something like a `-s | --search` option to the help command which could search the underlying command tree for anything relevant. `my-command help -s "jargon"` would output all subcommands and options of `my-command` that contain the string "jargon" in their name or help text. This search could be narrowed to a subcommand as well like `my-command sub-command help -s "jargon"`. Ideally this could be a fuzzy find to help people find commands that are similar to what they typed. SAP already does something similar with edit distance accounting for mispellings.