Default min interval for single values

[nickofthyme]

Is your feature request related to a problem? Please describe.
Yes, when using a histogram chart with a single bar and custom xDomain (setting min and/or max). The single bar is not displayed because we cannot compute a sensible interval.

Related to #836 & #1184

See https://codesandbox.io/s/flamboyant-tdd-b0hzt?file=/src/App.tsx

Describe the solution you'd like
A fallback minInterval of say 1/16 or 1/20 of the domain should be used to at least render the single value.

There should also be a development warning to indicate that we are shooting in the dark trying to set a practical interval based on the data and domain provided, and that the consumer should provide a value.

Describe alternatives you've considered
Set the minInterval whenever there is a single value.

[monfera]

A fallback minInterval of say 1/16 or 1/20 of the domain should be used to at least render the single value.

This assumes a medium long aspect ratio for the time domain. If x=time, and the chart is narrow as it can be on a dashboard, 1/16...1/20 may yield an overly thin spike bar, and if it's a full 27" screen width, then an overly wide bar

[nickofthyme]

⬆️ This was just an initial thought. The time approximation assumes a unit time to determine the best interval. @markov00 discussed moving this prop to the BarSeries spec and making it required. I think that is a better solution for this.