Chart export feature

[eric-gitta-moore]

Is your feature request related to a problem? Please describe.

I need to export these diagrams in my project for user use, but ngx doesn't seem to have such a feature, causing me to develop such a feature using other third libraries

Describe the solution you'd like

I wish ngx had a way to export charts

Describe alternatives you've considered

I have used third-party libraries to implement the chart export function, but it will lead to more boilerplate code

Additional context

It would be nice to have an export method like echarts.

reference: https://echarts.apache.org/en/api.html#echartsInstance.getDataURL

[sudarshansb143]

It will be a great addition +1