AIP-38 | Show historic metrics in Dashboard

[bbovenzi]

Once #42629 is merged, we can initialize our new homepage dashboard.

Right now historical_metrics only includes total counts. So we can build this part of the Dashboard mockups except for the bar graphs:

That includes:

• a date range selector
• horizontal bar graphs showing the total count of dag run and task instance states and their overall percentage

We'll ignore dag run type for now.

[tirkarthi]

@bbovenzi I can take this up if you are okay. I have prototyped below versions as per design without the checkbox and the bar charts which don't have data from API. I can raise this as PR for the base part and fine tune the UI/UX during review or subsequent PRs.