Remove localhost client

[colin-axner]

Summary

The localhost client is currently non-functional. We should either fix it or remove it so there is no confusion. I propose we remove it. The existing code is minimal and I think it'd be easy enough to reimplement it from scratch if we so desire. There was an existing proposed ADR on how to fix the implementation, but it's still very unclear when a use case for the localhost will arise (thus far no one has asked for it to be functional)

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[crodriguezvega]

Can we use this as a learning exercise? Is there anything valuable about IBC and/or light clients that could be learnt from fixing/re-implementing this?

[crodriguezvega]

We decided to remove it. 🔥