Implementing Media Controls for Voice Messages

[rapterjet2004]

• fixes control playback of voice messages in androids notification panel #6066

Harder than I thought, this required refactoring the entire media player io logic to use MediaSessionService as it's source of truth. While this simplifies the architecture a bit, it also means I have to go about and fix some old bugs once again.

🚧 TODO

• Get it working
• Fix Pause/Play btn state
• Allow seeking in UI
  • Seeking another messages seekbar also seeks the message next to it, when you play a another message before pausing the currently playing message.
  • SeekBar speed should match Thumb, might need to do some math here
• Add Message MetaData to Control Notification
• Allow waveforms
• Make played seconds update -_-
  • Seconds played should count down from duration

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/28387969161/artifacts/7958660485
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)