Use Consideration trait for storage deposit

[f-gate]

although what we have work right now:
paritytech/polkadot-sdk#1361
Is deffo worth investigating.
It was included in the polkadot-sdk 1.2 released on the 16th of October: https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-v1.2.0