Cleanup remaining low-level intrinsics that uses Attrs to use PrimValue

[tqchen]

After https://github.com/tlc-pack/relax/pull/392, we cleaned up CallBuiltin.

It would be great migrate the rest of the low-level intrinsics to use PrimValue, these functions include

• alloc_storage/tensor
• print/unique
• Other possible operators that comes with specialized codegen.

[slyubomirsky]

Are we removing attributes entirely from the language?

[tqchen]

I don't think we will remove Attrs entirely atm, but for some of the low-level ops that have special codegen behaviors, moving them to use PrimValue would be more beneficial(so we can for example leverage same codegen for compiled and vm)

[slyubomirsky]

That seems reasonable, thanks.