Decide whether to abbreviate `nanosecond` or not in aliases

[nicolo-ribaudo]

Currently we are inconsistent, using ns in https://tc39.es/ecma262/#sec-localtime and nanoseconds in https://tc39.es/ecma262/#sec-parsetimezoneoffsetstring and https://tc39.es/ecma262/#sec-getnamedtimezoneoffsetnanoseconds. Temporal will introduce a lot more usage of it in aliases.

I lean towards abbreviating it, even though it gets a bit awkward with the plural (I'd abbreviate both nanosecond and nanoseconds to just ns). I would also be happy to abbreviate millisecond to ms, e.g. https://tc39.es/ecma262/#sec-hostenqueuetimeoutjob.

We very briefly talked about this in the editor call yesterday, but didn't continue to wait for @linusg.

[linusg]

Abbreviating is fine by me despite the inconsistency with "seconds" which seems difficult to abbreviate in this context. (i've been on holiday for the past two weeks and out of the loop a bit, thanks for the ping :))

[nicolo-ribaudo]

So we actually also use microsecond, for which the only abbreviations I can come up with are both bad (us and μs with the non-ASCII character).