Fix #31: Make use of google sign in

[j-mahapatra]

Fixes #31

Summary

• Added a check for signed in user before playing music.
• Added a measurementId entry to firebaseConfig according to the latest firebase docs.

Recording after changes:

https://github.com/DhanushNehru/HarmonyCode/assets/107102771/38de0808-9c24-476a-a770-f21ea21978d8

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Name	Status	Preview	Comments	Updated (UTC)
harmony-code	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 9, 2023 6:35am

[DhanushNehru]

Looks great , Thanks for your contribution @j-mahapatra