bindings: rust: examples: replace tools examples with use case examples

bindings: rust: examples: replace tools examples with use case examples

Replace tool examples with use case examples drawn from the tools,
gpio_events example with buffered_event_lifetimes, and
gpio_threaded_info_events with reconfigure_input_to_output.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Erik Schilling <erik.schilling@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>