Integrate EFT as a Payment Method in Hyperswitch

[jarnura]

Electronic Fund Transfer is a redirection flow, that falls under Bank Redirect in Hyperswitch. We have to add EFT as a payment method.

• Add EFT under BankRedirectData enum in crates/api_models/src/payments.rs which has a structure:

Eft {
        /// The preferred eft provider
        #[schema(example = "ozow")]
        provider: String,
    }

• Everywhere the enum BankRedirectData is used we have to put EFT there.
• In the transformers.rs file of every connector, if the connector supports EFT we have to add implementations there otherwise we'll this as NotSupported or NotImplemented elsewhere.

Ref PR: #7304