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
a16d88d.

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`.
a16d88d.

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: #47080
PR-URL: #47084
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

doc/api/fs.md

@@ -5158,7 +5158,7 @@ changes:
     pr-url: https://github.com/nodejs/node/pull/47084
     description: Accept an additional `mode` option to specify
                  the copy behavior as the `mode` argument of `fs.copyFile()`.
-  - version: v17.6.0  
+  - version: v17.6.0
     pr-url: https://github.com/nodejs/node/pull/41819
     description: Accepts an additional `verbatimSymlinks` option to specify
                  whether to perform path resolution for symlinks.