test: add BigInt test for isDeepStrictEqual

Add some BigInt tests for test-util-isDeepStrictEqual to get 100%
coverage for lib/internal/util/comparisons.js.

PR-URL: https://github.com/nodejs/node/pull/25932


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>