feat(dpr): able to update dpr by resize

[Justin-ZS]

Summary

• Allow dynamic devicePixelRatio updates through the resize() method
• Add Layer.updateDpr() to keep canvas context dpr in sync

Fix

apache/echarts#21386

Usage

zr.resize({
    width: 800,
    height: 600,
    devicePixelRatio: window.devicePixelRatio
});

Changes

• Add optional devicePixelRatio parameter to PainterBase.resize() interface
• Add Layer.updateDpr() method
• Update Painter.resize() to trigger layer resize on dpr change
• Expose devicePixelRatio option in ZRender.resize()