Make Offering.PaywallComponents and paywallComponents public

[ajpallares]

Description

Removes the @_spi(Internal) marker from the Offering.PaywallComponents struct, the Offering.paywallComponents property, and the convenience initializer that accepts paywall components.

The internal-only details of PaywallComponents (its stored uiConfig/data properties and its initializer) remain @_spi(Internal) since they expose types (UIConfig, PaywallComponentsData) that are still SPI.

Motivation

Today, consumers of the SDK can read every property of an Offering except paywallComponents, which is hidden behind @_spi(Internal). This means there is no way to take an existing Offering and recreate it without losing the paywall components data.

By exposing the PaywallComponents type and the paywallComponents property as public (while keeping their internals SPI), callers can read paywallComponents from an existing Offering and pass it back into the public initializer, enabling lossless re-creation of an Offering value.

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Note

Low Risk
Low risk: this is a Swift API visibility change (SPI → public) with no behavioral logic changes, but it does expand the public surface area and ABI for Offering.

Overview
Makes Offering.PaywallComponents, Offering.paywallComponents, and the convenience Offering initializer that accepts paywallComponents public by removing @_spi(Internal), while keeping PaywallComponents’ stored properties and initializer SPI-only.

Updates API tests and generated .swiftinterface files to reflect the newly public symbol, initializer, and Sendable conformance.

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