[Feature]: add GetEpochInfo to get Epoch Info by identifier

[Narangde]

Summary

There is no getter of epoch info in epochs module.
As implemented in Osmosis, request to add GetEpochInfo to get epoch by identifier in epochs module.

Problem Definition

No getter in epochs module

Proposed Feature

Add implementation of GetEpochInfo to get epoch info by identifier in epochs module.

[julienrbrt]

Hey, you can use collections for that: epochsKeeper.EpochInfo.Get(ctx, id)

[julienrbrt]

The Osmosis implementation doesn't use the latest feature of the SDK for state management (collections)

[Narangde]

@julienrbrt Right, we can use simply epochsKeeper.EpochInfo.Get(ctx, id).

However, �when using the epochs module in another module, this getter is probably needed to get the epoch info. What do you think?

[julienrbrt]

However, �when using the epochs module in another module, this getter is probably needed to get the epoch info. What do you think?

Right, this is expected with collections. ref #20905.

[julienrbrt]

Feel free to open a PR to do a simple wrap in the meantime 👍🏾