feat(flutter): update to 2.4.7

[dcrawbuck]

Update Flutter SDK docs to version 2.4.7, including new transaction types and delegate callbacks.

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Note

Flutter docs updated to 2.4.7

• Adds 2.4.7 changelog with iOS SDK 4.12.7 and Android SDK 2.6.8
• Updates displayed latest version to 2.4.7 in index.mdx and sdk-reference/index.mdx
• Adds new SDK reference pages: SubscriptionTransaction and NonSubscriptionTransaction
  • Documents new fields in 2.4.7: offerType, subscriptionGroupId, and store for subscriptions; store for non-subscriptions
• Updates SuperwallDelegate to include userAttributesDidChange with implementation example
• Notes in setUserAttributes that userAttributesDidChange is invoked after attributes are applied

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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