feat[next][dace]: Modify name of stride symbols

[edopao]

Remove unnecessary unique ID, which makes code generation easier for ICON-DSL bindings.

[philip-paul-mueller]

Two underscore have special meaning in DaCe, i.e. __return. I am pretty sure that there would not be a collision, but I suggest to you that you prefix the hole thing with something __gtit to make sure that it belongs to you.

Nevertheless, I will approve your PR, since it is a suggestion, and there is no need for a second round.

[edopao]

@philip-paul-mueller Thanks, I agree with your comment - I was also expecting it, since you are already commented this once. However, the name of the size argument a few lines above ("__{field_name}_size_{dim_index}") has to match the name of the scalar symbol generated by GT4Py. For the strides, there is no such argument, so I could follow your suggestion, but I prefer to follow the same name convention as the size argument. If I see that it stops working, for any reason, I will change it.