enhancement: add equalizer

[NoelMacwan]

Adding equalizer would be plus, user will surely look forward.

[bxute]

Equalizer could be added, but due to the variation of audio bitrate and quality, we don't opt to go for it and stream directly in default mode.

[singhpratyush]

How much would the app size increase upon adding it? Will it be too much (>20%)?