Toolbar PNG export with desired scale or width

[rs-tsc]

Summary

We are facing an image blur issue while using the PNG export from the toolbar.

API Changes

1. Include a couple of options 1. scale & 2. width inside chart -> toolbar -> export -> png
2. If either of these options is present, it will pass the option to Export's dataURI method, which already has these scale and width options implemented inside it.
3. If both of them are present, like dataURI method, scale gets higher priority

Intended Use Case

Due to business needs, we are using small canvases and export to PNG from toolbar does provide any option to scale it or make it of desired width. So we need to add options to make it possible.

[rs-tsc]

The code is implemented and tested locally.

Exports.js

    ...
    exportToPng() {
        const scale = this.w.config.chart.toolbar.export.png.scale
        const width = this.w.config.chart.toolbar.export.png.width
        const options = scale ? {scale: scale}: width? {width: width}: undefined
        this.dataURI(options).then(({ imgURI, blob }) => {
    ...

[github-actions]

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