Expose healthRequest on PurchasesSwiftType

[aboedo]

Summary

• Move healthRequest from InternalPurchasesType to PurchasesSwiftType protocol, making it public
• Update implementation in Purchases.swift from internal to public
• Enables hybrid SDKs to call healthRequest through PurchasesHybridCommon

Test plan

• Verify existing healthRequest unit tests still pass
• Verify hybrid common layer can compile against updated SDK

🤖 Generated with Claude Code

[RevenueCat-Danger-Bot]

	1 Error
🚫	Label the PR using one of the change type labels. If you are not sure which label to use, choose pr:other.

Label	Description
pr:feat	A new feature. Use along with pr:breaking to force a major release.
pr:fix	A bug fix. Use along with pr:force_minor to force a minor release.
pr:other	Other changes. Catch-all for anything that doesn't fit the above categories. Releases that only contain this label will not be released. Use along with pr:force_patch, or pr:force_minor to force a patch or minor release.
pr:RevenueCatUI	Use along any other tag to mark a PR that only contains RevenueCatUI changes
pr:next_release	Preparing a new release
pr:dependencies	Updating a dependency
pr:phc_dependencies	Updating purchases-hybrid-common dependency
pr:changelog_ignore	The PR will not be included in the changelog. This label doesn't determine the type of bump of the version and must be combined with pr:feat, pr:fix or pr:other.

Generated by 🚫 Danger