JS API: Failure to handle RowSets with large numbers of ranges

[rcaudy]

Test query:

input=emptyTable(1_000_000_000).view("A=ii").where("A % 2 == 0")

[niloc132]

It turns out that, in Chrome at least, JS fixed arrays are limited in size to something like 112,813,857 elements, rather than the advertised spec size of (2^32)-1, or 4,294,967,296. The limit should be higher, but the resizing logic has a bug that prevents it from hitting its actual max of 134,217,726.

https://issues.chromium.org/issues/42210629
nodejs/node#47928 (comment)

Automatically flattening viewports will get us past this issue, since this bug means that we can't track more than 100 million of anything on the client without resorting to wasm or typedarrays for everything.