Add bar charts support

Dhiraj Bodicherlarequested to merge
add-bar-charts-support into master

Summary

This issue introduces bar charts so that it can be used in the monitoring dashboard as a part of our dogfooding efforts. This MR adds a basic version of bar charts.

Screenshots
GitLab UI component image
Bar chart tooltip bar_chart_tooltip
GitLab monitoring dashboard image

Mentions gitlab#202000 (closed)

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