Implement print.slang for Metal

[kaizhangNV]

Background: shader-slang/slang#6764

On Metal RWByteAddressBuffer::GetDimensions is not supported, because the buffer is mapped to a device pointer in Metal, it doesn't provide a way to query the size. Therefore, we will need another solution on Metal to pass the buffer size in.
This will involve adding the logic in

src/sgl/device/print.cpp 
src/sgl/device/print.h
src/sgl/device/print.slang