Bring back clonefile on Mac OS X

[mcollina]

Part of the reason why bun install is almost instantaneous is because of the use of clonefile, which implement a copy-on-write mechanism, actually avoiding the writes to disk altogether.

We exposed this via libuv some time ago, but this behavior was reverted in libuv/libuv#3987.

cc @santigimeno @cjihrig

[anonrig]

cc @nodejs/libuv can you take a look at this?

[7rulnik]

For me, it feels related:
pnpm/pnpm#5001
pnpm/pnpm#7031

[fengmk2]

https://nodejs.org/docs/latest/api/fs.html#fspromisescopyfilesrc-dest-mode

the document need to change?