Add Voice Message Recording and Playback

[bhavik-mangla]

Implement a feature that allows users to record short audio clips and send them as part of the conversation. This is useful when typing is inconvenient or when users want to share voice notes.

Goals:
• Provide an in-app audio recorder that captures audio.
• Store or stream the recorded audio via the existing file transfer mechanism.
• Enable playback of received voice messages within the chat.
• Create clean UI for audio viewing/transfer in the similar format as files transfer.(Take inspiration from whatsapp)

Possible Approach:
• Select and Use a Flutter audio recording package (e.g., flutter_sound, just_audio) for capturing and playing audio.
• Convert the audio file into a suitable format for file transfer.

[khushi-hura]

hey @bhavik-mangla I have tried working on this issue to the best of my knowledge, please review PR raised by me on this issue.
I ensure that the code works without any errors.

[dikshantbhangala]

@bhavik-mangla can i get to contribute on this??

[bhavik-mangla]

@dikshantbhangala yes, go ahead

[khushi-hura]

Hey @bhavik-mangla I worked on this, just got stuck in differentiating the message from other files, can u please help with that?

[dikshantbhangala]

@bhavik-mangla done with pull request!! plz check it out and tell me any required modifications required