Add Android web view cache warming

[JZDesign]

Checklist

• If applicable, unit tests
• If applicable, create follow-up issues for purchases-ios and hybrids

Motivation

Bring the Android Paywalls V2 asset pre-download path in line with the iOS jzdesign/test-web-warming concept by recognizing web view components and warming their content before rendering.

Description

• Adds an internal web_view paywall component model.
• Collects web view URLs during V2 paywall and workflow asset pre-download traversal, including nested stacks, headers, sticky footers, and sheet destination stacks.
• Adds a WebView-based pre-downloader with HTTPS-only loading, blocked mixed content, disabled file/content access, and bounded cleanup.
• Adds minimal RevenueCatUI rendering support for decoded web view components with matching URL hardening and WebView release cleanup.
• Adds targeted tests for component decoding and web view pre-download collection.

Verified with:

• ./gradlew :purchases:testDefaultsBc8DebugUnitTest --tests "com.revenuecat.purchases.utils.OfferingImagePreDownloaderTest" --tests "com.revenuecat.purchases.paywalls.components.WebViewComponentTests" :ui:revenuecatui:testDefaultsBc8DebugUnitTest --tests "com.revenuecat.purchases.ui.revenuecatui.helpers.ContainsUnsupportedConditionTests"
• ./gradlew detektAll

  

[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.

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