Web: [Charts] Add group series bars support for the BarChart component

Created by: vovakulikov

Follow up for https://github.com/sourcegraph/sourcegraph/issues/32940

Background

At the moment we have a BarChart component but this component doesn't support series view. At the moment it supports only "grouped" by type bars and doesn't support timeline data. I think it might be useful to have series line representation BarChart component, the one like you can see on the screenshot below. It will allow us to change different chart views for the Code Insights Search insights.