build: make lint-addon-docs run only if needed

Currently, the lint-addon-docs targets recipe will always be run.
This commit makes lint-addon-docs a phony target and adds a new
target named tools/.doclintstamp what will be an actual file,
similar to what the lint-cpp target does.

PR-URL: https://github.com/nodejs/node/pull/24993


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>