Expose all arbitraries supported by fc.object as their own arbitraries

[TomerAberbach]

🚀 Feature Request

fc.object supports emitting all sorts of stuff for its values.

Some of them have their own arbitraries (e.g. withBigInt option corresponds to fc.bigInt), but some do not (e.g. withMap option doesn't have a corresponding exported arbitrary).

I think all of the things that fc.object can generate should be supported as standalone arbitraries too.

Motivation

It's convenient to be able to generate these types outside an object.

Example

// To generate Map<string, unknown>
fc.map(fc.string(), fc.anything())

[dubzzz]

Good idea 👍 I think my main blocker was set as it was something in v2. But with v2 I don't have it anymore so I could clearly introduce these helpers.