feat: Equalizer

[puckey]

See #1950

Implements equalizer functionality for Android – relies on the following pr to be merged: doublesymmetry/KotlinAudio#68

• TrackPlayer.getEqualizerSettings(): Promise<EqualizerSettings>
• TrackPlayer.setEqualizerEnabled(enabled: boolean): Promise<void>
• TrackPlayer.setEqualizerPreset(preset: string): Promise<void>
• TrackPlayer.setEqualizerLevels(levels: number[]): Promise<void>
• useEqualizer() hook which returns updated EqualizerSettings whenever any of its properties change

type EqualizerSettings = {
  activePreset?: string;
  bandCount: number;
  bandLevels: number[];
  centerBandFrequencies: number[];
  enabled: boolean;
  lowerBandLevelLimit: number;
  presets: string[];
  upperBandLevelLimit: number;
}