feat!: add device 3DS2 fields and remove unsupported features

[tomasz-pazdziurek-cko]

Caution

BREAKING CHANGE

Title: feat: Update library to 4.0.0 (device/3DS fields, card chaining, submerchants; remove legacy subscriptions API)

Body:

Summary

• Regenerated bindings from 4.0.0 → 6.0.0 of the ProcessOut API spec.
• Adds device/3DS SDK selection, card network-token/scheme-chaining fields, and submerchant support.
• Removes the legacy Subscriptions/Plans/Coupons/Discounts/Addons/Activity resources, which are no longer part of the public API surface.

Added

• Device / 3DS: Device.ThreedsSdk, Device.Platform, and InvoiceDevice.Platform — explicit 3DS SDK type (web/ios/android/other) and device platform metadata.
• Card scheme chaining & network tokens: new CardSchemeDetails type (transaction_id, transaction_link_id) wired into CardCreateRequest/CardUpdateRequest; Card.PreferredCardType, Card.InitialSchemeTransactionID, Card.PaymentAccountReference, Card.BillingCountryCode; CardContact.BillingCountryCode (new preferred field, CountryCode now documented as deprecated alias); Token.ProvisionNetworkToken sticky opt-in/out flag, also added to Invoice.Authenticate/Authorize/Capture params.
• Submerchants: new Submerchant and SubmerchantMapping types, plus Invoice.SubmerchantID on invoice creation.
• Invoice: new Invoice.Authenticate action; TransactionLinkID and ProvisionNetworkToken added to Authenticate/Authorize/Capture; Metadata added to Payout; PaymentConfiguration added to Create.
• Misc smaller additions: TransactionOperation.CaptureType, UnsupportedFeatureBypass.SplitPayments, Transaction.Origin, InvoiceExternalFraudTools.Riskified.

Removed

• Activity, Addon, Coupon, Discount, Plan, Subscription types and all associated client methods (NewActivity, NewAddon, NewCoupon, NewDiscount, NewPlan, NewSubscription, Customer.FetchSubscriptions, Project.FetchSupervised, etc.).
• Invoice.Subscription/SubscriptionID, Transaction.Subscription/SubscriptionID, Customer.Subscriptions fields.

Breaking changes

• Removed types/methods above will break any caller still using the Subscriptions/Plans/Coupons/Discounts/Addons/Activity API.
• Changed method signatures: Invoice.Authorize, Invoice.AuthorizeWithContext, Invoice.Capture, Invoice.CaptureWithContext now return an additional value (extra string return, e.g. a webhook/redirect-type field) — signature changes from (*Transaction, *CustomerAction, error) to (*Transaction, *CustomerAction, string, error). Callers must update to handle the new return value.

[datadog-eu-processout]

⚠️ Warnings

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