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Introduce await.all / await.race / await.allSettled / await.any to simplify the usage of async functions

Stage: 1

Champions: Jack Works, Jordan Harband

When developers use async functions, they have to know about Promise if they want to handle multiple tasks concurrently (Promise.all, eg), this is some kind of "abstraction leak".

This proposal is intended to fix the problem by introducing concurrent Promise utils in the async-await style.

// before
await Promise.all(users.map(async x => fetchProfile(x.id)))

// after
await.all users.map(async x => fetchProfile(x.id))

Syntax:

await.all expr
// eq: await Promise.all(expr)

await.race expr
// eq: await Promise.race(expr)

await.allSettled expr
// eq: await Promise.allSettled(expr)

await.any expr
// eq: await Promise.any(expr)