Add example support to schemas to enable unittests

[Fleker]

Add example field to register and functions Created a unit test template that can create unit tests for template Update validator to optionally run unit tests on a template Add examples to BMP280 peripheral

Fixes #271

[Fleker]

It works cleanly with the validator tooling.

[Fleker]

For peripherals w/o examples, it will generate a file w/o any tests, which is okay.

[Fleker]

To do still are updating templates to handle this new field.

[Fleker]

I'd like to put the .tex doc into Overleaf just to check it renders. And maybe change how the table works so it remains the same for files w/o examples.

[Fleker]

Fixed the datasheet.