show sideTitles without reservedSize over/inside the chart

[JonasJW]

Is your feature request relasted to a problem? Please describe.
With the current sideTitles, there is always space between the chart and the titles. In some cases, a edge-to-edge chart that renders the sideTitles over/inside the actual chart, instead of next to it, looks more elegant.

Describe the solution you'd like
It would be great if there were an option to render titles on the inside of the chart

[xdxdhh]

I think there currently is option for that, the AxisTitles object has SideTitleAligment, which is set to outside by default. You can try to set it to inside.