Add separate examples directory

[createyourpersonalaccount]

Desired Behavior

The example directory contains cram tests and is not very intuitive for beginners.

I have the following examples in mind that I would like to contribute to Dune: https://github.com/createyourpersonalaccount/dune_examples but cram tests get in the way in my opinion.

See also #9163 (comment) and the responses for some background on this suggestion.

Example

Under the example directory, there could be the cram-examples directory. But there should also be other examples, such as the ones I linked above in my repository.

[createyourpersonalaccount]

@Alizter Ping on this, you can see the two examples that I had in mind at https://github.com/createyourpersonalaccount/dune_examples

[Alizter]

Hi, we discussed this in the dev meeting today. We are open to adding new examples in the way you described. Our first priority would be to take the feedback on cram tests and write some better documentation.

https://github.com/ocaml/dune/wiki/dev-meeting-20231129#examples-directory-alizter