Add @notUndefined attribute to more Stdlib abstract types

[mediremi]

Adds the @notUndefined attribute to:

• Map.t
• Set.t
• WeakMap.t
• WeakSet.t
• Stdlib_Intl_*
• Stdlib_AsyncIterator
• Stdlib_Iterator
• Stdlib_DataView
• Stdlib_ArrayBuffer
• Stdlib_JsError
• Stdlib_Symbol
• Stdlib_TypedArray

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commit: 2bbdf90

[cknitt]

Thanks, that's great!
But I think there are more candidates, like ArrayBuffer.t, or Symbol.t.

Would you mind looking through all the stdlib/runtime files and extending this PR accordingly?

[nojaf]

@fhammerschmidt should we document this attribute as well?
Is this something users want to use in their own code?

[fhammerschmidt]

Could be useful for library authoes at least. So yes.

[mediremi]

@cknitt I've updated the PR to also add the attribute to any other abstract types I could find in Stdlib 👍

[cknitt]

Thanks a lot! 🎉