n-api: detach external ArrayBuffers on env exit

Make sure that `ArrayBuffer`s created using
`napi_create_external_arraybuffer` are rendered unusable
after its memory has been released.

PR-URL: https://github.com/nodejs/node/pull/30551


Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>