fs: add support for mode flag to specify the copy behavior

`fs.copyFile()` supports copy-on-write operation
if the underlying platform supports it by passing a mode flag.
This behavior was added in
https://github.com/nodejs/node/commit/a16d88d9e9a6581e463082549823189aba25ca76.

This patch adds `mode` flag to `fs.cp()`, `fs.cpSync()`,
and `fsPromises.cp()` to allow to change their behaviors
to copy files.

This test case is based on the test case that was introduced
when we add `fs.constants.COPYFILE_FICLONE`.
https://github.com/nodejs/node/commit/a16d88d9e9a6581e463082549823189aba25ca76.

This test strategy is:

- If the platform supports copy-on-write operation,
  check whether the destination is expected
- Otherwise, the operation will fail
  and check whether the failure error information is expected.

Fixes: https://github.com/nodejs/node/issues/47080
PR-URL: https://github.com/nodejs/node/pull/47084
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

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