feat(audioPlayer): Auto play voice messages which are grouped together

[Souptik2001]

☑️ Resolves

• Fix Let audio recordings play after each other #13199

Note: In Whatsapp (whose example is given in the issue), the voice messages auto-play only when they are grouped together. Therefore I tried to replicate that only. If there's a message between two voice messages, it will not be auto-played.
That being said, its very easy to change this behaviour. We just need to remove this since check over here.

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

Before

Before.mov

After

After.mov

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
  • Not risky to browser differences / client
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

[Antreesy]

Hi, thanks for the contribution!
I see the current implementation a bit overcomplicated, please see comments

[Antreesy]

Hi, just tested the PR. Works nice!

Also looks good code-wise, left a fixup commit to reduce unneccessary changes. Waiting for @DorraJaouad approval, then we can squash and merge it.

[DorraJaouad]

Tested ✅
Code-wise ✅

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[Antreesy]

/backport to stable30