feat: add comprehensive mindful session support

[robertherber]

Add dedicated helper functions, hooks, and example UI for working with
HealthKit mindful sessions. This provides developers with an easier API
for tracking meditation and mindfulness data.

Changes:

• Add saveMindfulSession() helper for recording mindful sessions
• Add queryMindfulSessions() for retrieving session history
• Add getMostRecentMindfulSession() for latest session
• Add subscribeToMindfulSessions() for real-time updates
• Add useMostRecentMindfulSession() React hook
• Add useSubscribeToMindfulSessions() React hook
• Add example screen in example app with session creation and display
• Update README with mindful session usage examples
• Export all new functions from main healthkit module

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Latest commit: 127d102

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commit: 127d102