Support sharding GRES

[rezib]

Is your feature request related to a problem? Please describe.
As discussed in #616 by @LarsKoeppel

I noticed that gres/gpu is supported, but I couldn’t find any mention of gres/shard. Is this available? And if so, what needs to be configured for it to appear in the interface?

Describe the solution you'd like
Support representation of GPU sharding GRES.

Additional context
N/A

[rezib]

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