Add `TempCollection<T>` type #492

Job	Run time
csproj-build (Release, true)	48s
csproj-build (Release, false)	44s
csproj-build (Release_NoProgress, true)	43s
csproj-build (Release_NoProgress, false)	46s
csproj-build (Debug, true)	48s
csproj-build (Debug, false)	43s
csproj-build (Debug_NoProgress, true)	46s
csproj-build (Debug_NoProgress, false)	46s
	6m 4s

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