refactor: 🚧 add starknet_version and eth_l1_gas_price

[jbcaron]

• add starknet_version and eth_l1_gas_price in DB
• change type of starknet_version from u8 to Felt252Wrapper

Pull Request type

• Feature

What is the current behavior?

Resolves: #25 #26

What is the new behavior?

• The block headers contain the starknet _version and eth_l1_gas_fee fields

Does this introduce a breaking change?

No

Other information

[antiyro]

Could you add changelogs and run npx prettier -w ., npx @taplo/cli fmt --config ./taplo/taplo.toml and cargo fmt just to unlock most of the checks