Add support for host-builds and "array of pointers" when building/updating real-time ray tracing acceleration structures

[johannesugb]

Currently, the build/update methods of both, class bottom_level_acceleration_structure_t and class top_level_acceleration_structure_t, support only "pointer to an array"-style input.

Add support for:

• "array of pointers" input to bottom level acceleration structure builds/updates
• "array of pointers" input to top level acceleration structure builds/updates
• Host-builds of bottom level acceleration structures
• Host-builds of top level acceleration structures

The relevant code that needs to be updated/extended in order to support these different built/update types is contained in the methods:

• top_level_acceleration_structure_t::build_or_update
• bottom_level_acceleration_structure_t::build_or_update

More information about "array of pointers" input format can be found here: VkAccelerationStructureBuildGeometryInfoKHR => the description of VkBool32 geometryArrayOfPointers;

More information about host builds of acceleration structures can be found here: 36.5. Host Acceleration Structure Operations

Definition of done:

• All the new types of acceleration structure builds/updates mentioned above have been implemented
• The interfaces to the methods mentioned above have been updated, and they are easy, convenient, and safe to use.
• There should be an example application that lets users choose between all the different types of builds/updates of acceleration structures. This functionality shall either be integrated into an entirely new ray tracing example application or it has been added to an existing example application.
• Out of curiosity, a quick small test has been made, measuring the build time differences of ~10,000 host builds compared to ~10,000 device builds.
• It has been determined if the assert(sizeof(VkAabbPositionsKHR) == result.mSizeOfOneElement); in buffer_meta.hpp#L833 is really appropriate.
• It has been determined if the assert(sizeof(VkAccelerationStructureInstanceKHR) == result.mSizeOfOneElement); in buffer_meta.hpp#L912 is really appropriate.
• All modified or new methods, as well as the example application are well documented and the Contribution Guidelines have been followed.