Calculate offset between svg axis and the chart svg

[dafortin]

Calculate the offset between the SVG axis and the chart SVG to reduce the distance between the SVG axis and the chart SVG to 0 to have continuous grid lines.

• Deprecate frost-chart-x-axis-svg offset
• Calculate automatically the distance between the SVG axis and the chart SVG (50% of the height of the y axis last tick)
• Remove the distance calculated above to the top attribute calculation in frost-chart-svg