feat: add support for Firefox data collection permissions

[suveshmoza]

Overview

Adds support for Firefox's required data_collection_permissions field in browser_specific_settings.gecko. As of November 3rd, 2025, all new Firefox extensions must declare their data collection practices.

Changes

• Add FirefoxDataCollectionType and FirefoxDataCollectionPermissions TypeScript types
• Update UserManifest to include data_collection_permissions in browser_specific_settings.gecko
• Add warning when building for Firefox without data_collection_permissions #specified

Manual Testing

Building the wxt-demo for Firefox will show a warning to add data_collection_permissions to manifest config.

Related Issue

This PR closes #1975

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