Migrating compilation from comptime_struct to struct

[jonathan-pepino-schaefer]

The newest Cerebras SDK version (2.10.0) does not support the comptime_struct type and the @concat_structs operator anymore (see here). I suggest updating the compiler to account for that.

My primary question: is backward compatibility needed, e.g. do we need to implement a version check and do conditional compilation based on the cluster sdk version?

[tbennun]

Looks like it's only used in benchmarking, so it should be easy to replace. The only issue would be backwards compatibility, which we do want to support. However, checking the SDK version has to be done based on the SDK container, so it is not easy to do from SpaDA itself. Any suggestions on how to check the SDK version?