[Placeholder] Lightclients as implementations using x/accounts

[damiannolan]

Summary

Placeholder issue for migration of light client modules to implementations of the new cosmos-sdk module: x/accounts
See: https://github.com/cosmos/cosmos-sdk/tree/main/x/accounts

A deep dive should be conducted on x/accounts and how it could be integrated with ibc as a means for light client state verification and updates.

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[gjermundgaraba]

We might look into this later, but closing as not planned for now.