[SmartContract] Integration and example

[bkontur]

TODO

• Design simple example/usage, how would Smart Contract use Web3Storage (e.g. create storage aggrement or bucket), something really close to the expected reality, how dApps would use this
• Setup pallet_revive just to the testnet runtime storage-parachain-runtime (check PolkadotSDK asset-hub-westend runtime or Fellows asset-hub-polkadot)
• Prepare simple example smart contract + SC precompile for Web3Storage for designed example
• Add e2e integration tests covering: SC -> Precompile -> Web3 Storage pallet -> Provider node