Feat: files field support for profile cloud #1541

[kkerti]

This pull request introduces improvements to how public profile data is queried and validated, adds support for configuration files in schemas. The most important changes are outlined below.

Public Profile Query Improvements

• Introduced a new publicProfileFields constant in publicCloudQueries.ts to explicitly specify which fields are selected when querying public profiles, ensuring only necessary data is fetched and returned. This change is applied to all relevant query endpoints (readAllProfiles, readUserProfiles, and readSingleProfile).
• These firebase functions are consumed by the public website.

Schema Enhancements

• Added a new ConfigFileSchema and corresponding ConfigFile type to support validation of configuration files, including optional mimeType.
• Updated BaseConfigSchema to include an optional files array, allowing configs to reference associated files.

[github-actions]

Visit the preview URL for this PR (updated for commit 7ae8a30):

https://profile-cloud-dev--pr174-feature-1541-file-ma-7r2p07d1.web.app

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