fs: unset FileHandle fd after close

• Do not set the fd as a property on the native object.
• Use the already-existent GetFD() method to pass the fd from C++ to JS.
• Cache the fd in JS to avoid repeated accesses to the C++ getter.
• Set the fd to -1 after close, thus reliably making subsequent calls using the FileHandle return EBADF.

Fixes: https://github.com/nodejs/node/issues/31361

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines