Add default decimal radix codegen

[leonardt]

Verilator requires that if we emit a size specifier (e.g. 28'20') that we also emit the radix specifier (it doesn't use decimal by default), so we need 28'd20

[rsetaluri]

This is the thing inferred by default right? just making sure no existing things will break by making this explicit

[leonardt]

Correct, this is just making what’s inferred explicit so it should not break any code