Add GraphTensor::repeat with shape rank validation

[MagellaX]

Issue: Closes #226

[chatgpt-codex-connector]

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[MagellaX]

any takes @jafioti

[jafioti]

I think it looks correct, but I'm going to add back in 'z' striding in tensor strides so that this can be done zero cost (not needing a gather op).

[MagellaX]

I think it looks correct, but I'm going to add back in 'z' striding in tensor strides so that this can be done zero cost (not needing a gather op).

Sounds good to me. I just wanted to get repeat in with correct behavior first (incl. rank + zero-repeat checks). let me know for the zero-cost stride version as the follow-up...