Roblox / roact / 544

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Make Fragment an Element (#214)

* Make Fragment an Element

Fragments can not be used directly as children of a component:

local function component()
    return Roact.createElement("Frame", {}, {
        fragments = Roact.createFragment({
            A = Roact.createElement("Frame", {}, {})
        })
    })
end

Turning Fragments into Elements make them have their own virtual node,
so they can be reconciled as any other nodes.

* Add fragment tests

* Add empty fragment tests

* Remove unused spy

* Make test assertion clearer

* Update changelog

* Update CHANGELOG.md

Co-Authored-By: Paul Doyle <37384169+ZoteTheMighty@users.noreply.github.com>

* Update fragments tests

16 of 16 new or added lines in 3 files covered. (100.0%)

1158 of 1245 relevant lines covered (93.01%)

40.68 hits per line