feat(epochs): add wrapper of epoch getter (#22068)

x/epochs/README.md

@@ -68,22 +68,6 @@ The `epochs` module emits the following events:
 
 Epochs keeper module provides utility functions to manage epochs.
 
-``` go
-// Keeper is the interface for epochs module keeper
-type Keeper interface {
-  // GetEpochInfo returns epoch info by identifier
-  GetEpochInfo(ctx sdk.Context, identifier string) types.EpochInfo
-  // SetEpochInfo set epoch info
-  SetEpochInfo(ctx sdk.Context, epoch types.EpochInfo)
-  // DeleteEpochInfo delete epoch info
-  DeleteEpochInfo(ctx sdk.Context, identifier string)
-  // IterateEpochInfo iterate through epochs
-  IterateEpochInfo(ctx sdk.Context, fn func(index int64, epochInfo types.EpochInfo) (stop bool))
-  // Get all epoch infos
-  AllEpochInfos(ctx sdk.Context) []types.EpochInfo
-}
-```
-
 ## Hooks
 
 ```go

x/epochs/keeper/epoch.go

@@ -5,8 +5,15 @@ import (
 	"fmt"
 
 	"cosmossdk.io/x/epochs/types"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
+// GetEpochInfo returns epoch info by identifier.
+func (k Keeper) GetEpochInfo(ctx sdk.Context, identifier string) (types.EpochInfo, error) {
+	return k.EpochInfo.Get(ctx, identifier)
+}
+
 // AddEpochInfo adds a new epoch info. Will return an error if the epoch fails validation,
 // or re-uses an existing identifier.
 // This method also sets the start time if left unset, and sets the epoch start height.