runners: add minichlink

This commit adds a runner wrapper for the 'minichlink' program which
offers a free, open mechanism to use the CH-LinkE programming dongle for
the CH32V003.

https://github.com/cnlohr/ch32v003fun/tree/master/minichlink



Signed-off-by: Michael Hope <michaelh@juju.nz>
Signed-off-by: Dhiru Kholia <dhiru.kholia@gmail.com>