assert, tools: enforce strict (not)equal in eslint

Extend no-restricted-properties to catch use of assert.equal() and
assert.notEqual() and require assert.strictEqual() or
assert.notStrictEqual() instead.

Also update the eslint-ignore in lib/assert.js to avoid
assert.equal/notEqual linter errors in their definitions.

PR-URL: https://github.com/nodejs/node/pull/10698


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>