Complement validator data with miners key in wandb

[p-ferreira]

Validators from the community mentioned that they are getting blacklisted by some miners. It would be valuable for the validator logs to have this information as it can accelerate analytics. The implementation could be easily deployed by selecting the coldkeys and hotkeys from the axons at the forward step.

[p-ferreira]

This task concerns on adding the coldkey and hotkey to the wandb logs. Those fields can be obtained from the axon used to get the uids in the forward step.