Support help-echo for Transient infix arguments

[kickingvegas]

Enhancement Request

Support messaging a help/doc string for Transient infix arguments.

To my knowledge, infix arguments do not support having a help or docstring attribute. Rather Transient makes the assumption that the argument corresponds to a command line tool option that is documented with an installed man page.

A desired enhancement would be to have both short and long docstring support for infix arguments. The short docstring could be messaged in the minibuffer upon an event such as a mouse-over. The longer docstring could be loaded into a help buffer that is invoked by the key sequence ? {argument binding}.

If existing functionality can achieve the behavior described above, please provide guidance.