[Feature] Support drawing the horizontal bar chart

[hsunpei]

Purpose

Previously, we can only draw vertical bar charts. Since horizontal bar charts are particularly useful on mobile devices, it is desirable to have it supported.

This PR realize drawing the horizontal bar chart by analyzing the data types of the X and Y axis: if the data type of the x-axis is quantitative, it should draw a horizontal chart, and draw the bars from the y-axis instead (via passing down the prop drawFromXAxis={false}).

Additionally, to make the charts which have both positive and negative value on the quantitative axis more readable, it adds a gray auxiliary line at zero-value.

• Tasks: See Support horizontal bar charts & Display a horizontal line at zero if there are negative y values like c3: List of TODO items #25

• Updated doc (Click Chart > Bar Chart): https://ichef.github.io/transcharts/

Changes

• Support drawing the horizontal bar chart
• Add a gray auxiliary line at zero-value
• Disable tslint on the length of the comments
• Disable the checkings of unused variables on development

Screenshots

Horizontal chart

Original vertical chart => Transposed horizontal chart

• Original vertical chart
  

• Transposed horizontal chart
  

Displaying tooltips

[zhusee2]

Looks great to me! ✨