refactor(charts): split into separate entry point

[akashsonune]

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[github-actions]

Documentation.
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Coverage Reports:

• element-ng
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[github-actions]

[akashsonune]

@dr-itz can you provide some feedback. not everything is moved yet. its just the si-chart, common stuff, sankey and sunburst. For si-chart,I need to find a way to import all the chart types from echarts