Implemented VmaBlockMetadata_Buddy::GetUnusedRangeSizeMax().
Implemented VmaBlockMetadata_Buddy::GetUnusedRangeSizeMax().

GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator