chore: remove unused store keys

[cmwaters]

This removes the memory and store keys in the blob keeper as they are not needed.

In addition it cleans up some of the testing in the blob package

[coderabbitai]

Walkthrough

Walkthrough

The changes across various Go files indicate a refactoring in the codebase, particularly within the keeper package of a module. The refactoring involves removing the usage of store keys from several functions and structures, suggesting a design shift away from using these keys directly. The tests have been updated to reflect these changes, with a new CreateKeeper function introduced to replace the old pattern of keeper instantiation. The package names have been updated to keeper_test, indicating a move towards black-box testing.

Changes

File Path	Change Summary
app/app.go	Removed blobmoduletypes.StoreKey from the New function and its initialization.
x/blob/keeper/gas_test.go, x/blob/keeper/genesis_test.go, x/blob/keeper/grpc_query_params_test.go, x/blob/keeper/params_test.go	Changed package to keeper_test, replaced old keeper creation with CreateKeeper function, and updated test functions accordingly.
x/blob/keeper/keeper.go	Removed storetypes import, storeKey, and memKey from Keeper struct and updated NewKeeper function signature.
x/blob/keeper/keeper_test.go	Changed package to keeper_test, added CreateKeeper function, updated TestPayForBlobs to use CreateKeeper, and added new imports.

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