Use 1.5 growth factor for CowData

[Nazarwadim]

Same as #100944 but for CowData.
Similarly, if we call resize greater than 1.5 * capacity, then as much memory as we request is allocated, not a power of two.

I tested the memory usage in tps-demo and it decreased by several tens of megabytes.

[hpvb]

This is not a bad idea, but using floating point math here is not required, and the move from/to xmm regs might be detrimental to performance, especially when inlined.

https://godbolt.org/z/Phc53zGq1

Edit: This also alleviates the need for the ceil call.

[Nazarwadim]

@hpvb See https://godbolt.org/z/Kjjaaeob8.

Also, I don't think we need to bother with optimization, since this event is unlikely and we will spend more time on branching and memory allocation.

[Nazarwadim]

Ohhh no, poor dependencies. There is probably a size dependency in c# and gdextension.