Simple adapter for time axes

### Feature Proposal

Having rather simple use cases and reading these articles "Do you really need a date library?" I was wondering whether it wasn't possible to write an adapter for basic needs using Intl.DateTimeFormat only.

### Possible Implementation

[Here](https://github.com/mnlipp/jgrapes-webconsole/blob/master/org.jgrapes.webconsole.provider.chartjs/resources/org/jgrapes/webconsole/provider/chartjs/chart.js/adapters/chartjs-adapter-simple.js) is my code. It might serve as a starter for a default adapter that needs to be replaced with a date library based adapter only if more sophisticated parsing/formatting functions are required.