add spatch to detect implicit bool/int/result cast

add spatch to detect implicit bool/int/result cast

Detection of implicit cast from a boolean into an int, or an
isc_result_t into a boolean (either in an assignement or return
position).

If such pattern is found, a warning comment is added into the code (and
the CI will fails) so the error can be spotted and manually fixed.

(cherry picked from commit 754595ea2d9aee4e789d6fc0f295f64f0e2312d6)