crypto: add KeyObject.asymmetricKeySize

Expose the size of asymetric keys of crypto key object from the
crypto module added in v11.6.0.

PR-URL: https://github.com/nodejs/node/pull/26387
Refs: https://github.com/nodejs/node/pull/24234


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>