Sound Meter UI and real-time sound measurement.

[Yugesh-Kumar-S]

Description

This issue aims to implement the Sound Meter UI in the PSLab Flutter app by porting the corresponding feature from the PSLab Android app. The Sound Meter should display real-time sound intensity (in decibels) using the device's microphone.

Objectives

• Maintain consistency with the existing PSLab Android app's Sound Meter behavior and visual design.

• Display real-time sound level (in dB) using an interactive and visually clear gauge and line chart.

• Integrate continuous audio data streaming using the device's microphone with a responsive UI that reflects changes instantly.