misc: chore: Use explicit types in Memory project

src/Ryujinx.Memory/AddressSpaceManager.cs

src/Ryujinx.Memory/BytesReadOnlySequenceSegment.cs

src/Ryujinx.Memory/IVirtualMemoryManager.cs

src/Ryujinx.Memory/MemoryManagementWindows.cs

src/Ryujinx.Memory/Range/MultiRange.cs

src/Ryujinx.Memory/Range/MultiRangeList.cs

src/Ryujinx.Memory/Range/NonOverlappingRangeList.cs

src/Ryujinx.Memory/Tracking/MemoryTracking.cs

src/Ryujinx.Memory/Tracking/MultiRegionHandle.cs

src/Ryujinx.Memory/Tracking/RegionHandle.cs

src/Ryujinx.Memory/Tracking/SmartMultiRegionHandle.cs

src/Ryujinx.Memory/Tracking/VirtualRegion.cs

src/Ryujinx.Memory/VirtualMemoryManagerBase.cs

src/Ryujinx.Memory/WindowsShared/PlaceholderManager.cs