n-api: simplify bigint-from-word creation

Macro `CHECK_MAYBE_EMPTY_WITH_PREAMBLE()` does the work of checking
the `TryCatch` and returning `napi_pending_exception` so this change
reuses it for `napi_create_bigint_words()`.

Signed-off-by: Gabriel Schulhof <gabriel.schulhof@intel.com>
PR-URL: https://github.com/nodejs/node/pull/34554


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>