Add non-empty-list pseudo-type

[schodemeiss]

Add support for 'non-empty-list'.

See https://phpstan.org/writing-php-code/phpdoc-types#lists

Symfony's Serializer also uses the TypeResolver library to determine how to serialize 'list's, but currently doesn't support 'non-empty-list' due to it missing here. This resolves that, which means arrays of objects can correctly be serialized into that array of objects, and vice-versa.

[jaapio]

Thanks, please note that the current main branch (1.x) is not stable for release yet. It might take a while before we get there. due to some BC issues we are facing.

#178

[schodemeiss]

Thanks, please note that the current main branch (1.x) is not stable for release yet. It might take a while before we get there. due to some BC issues we are facing.

No worries. I fixed the code-style error in the meantime. So this should be good to merge in should it be approved.

Anything I can do to help out with #178 ? For example, if it's possible how to describe how to reproduce, I might be able to help mend that.

[jaapio]

I will come back to this, but it is related to #176.

We supported a notation with nullable types like native php did. But we dropped this because phpstan does not support this in types.