feat(terser): expose terser options

[dgmachado]

feat(terser): expose terser options: mangle, keep_classnames and keep_fnames

Exposing these options allow us to customize the terser properties.

config.optimization = {
    minimize: true,
    minimizer: [
      new minifyPlugin({
        minifier: 'terser',
        keep_fnames: true,
      }),
    ]
};

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Latest commit: 847b1b6

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[hardfist]

just FYI this is a temporarily package we will remove this package once we are compatible with terser-webpack-plugin