Create a chart component

[timroes]

To unify the chart styling across Kibana and other Elastic UIs.

This first chart component should be a replacement for classical axis charts (line chart, bar chart, area chart). So it needs to support all functionality the current chart implementations can do, which are at least (but not limited to):

• Draw line, bar, area or point charts
• Allow multiple series per chart
• Allow to specify and configure multiple y-axis
• Allow to configure at least one x-axis
• Tooltips on hover
• Configurable chart legend
• Provide a good default styling and color scheme
• Don't require redraw to draw new data

I also try to label issues in the current chart implementation, that we might want to look into with this component with the :EuiChart label in the Kibana repo.