[v14.x Backport] fs: `writeFile` support `AsyncIterable`, `Iterable` & `Stream` as data argument#39973

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aduh95 wants to merge 3 commits intonodejs:v14.x-stagingfrom

aduh95:backport-fsp-writefile-asynciterator-v14

Commits on Sep 1, 2021

stream: move duplicated code to an internal module

Trott
authored and
aduh95
committed
fs: add support for async iterators to `fsPromises.writeFile`

HiroyukiYagihashi
authored and
aduh95
committed
fs: add docs and tests for `AsyncIterable` support in `fh.writeFile`
aduh95
committed