Add CMake option for initializing all memory to 0

[adayton1]

In some cases, it is desirable to have memory initialized to 0 (particularly for debugging). This option is controlled by passing CHAI_ENABLE_ZERO_INITIALIZED_MEMORY=ON to CMake. It is off by default to avoid imposing any overhead.

[adayton1]

I don't think the CI failure is related to my change. Looks like some build artifacts are not cleaned up correctly.

[rrsettgast]

Would it be also useful to be able to initialize values to like the maximum of the range so you would trigger an overflow if not initialized?

[adayton1]

Are you thinking something like std::numeric_limits::max()? I like the idea, but it does get a little more complicated since the particular type is not available for the ArrayManager::allocate (it appears to be available for ArrayManager::reallocate, however). So either we would have to add the type for the ArrayManager::allocate call, or we would have to plumb this into the ManagedArray class itself. @davidbeckingsale, any ideas?

[robinson96]

LGTM