fix: Do not wrap an example list value in another list

[psamuels00]

The purpose of this PR is to allow a list of values (more than one) to be presented as the value of an Open API Example. In all the examples I found online, only a single value is supplied, which value is automatically turned into a list. Also, there are no unit tests for handling a list of values.

Background

In 0.22.0, a change was made, reflected by the following entry in the release notes:

Examples are now wrapped in pagination/lists when endpoint/serializer is many=True

Based on the following decorator...

@extend_schema(
    examples = [
        OpenApiExample(
            "name",
            value={"pet": "dog"}
        ),
    ]
)

...the Swagger example renders like this:

[
  {
    "pet": "dog"
  }
]

So far, so good.

The Problem

If a list is explicitly supplied for the example value, it is still wrapped in a list. Given the following...

@extend_schema(
    examples = [
        OpenApiExample(
            "name",
            value=[
                {"pet": "dog"}
                {"pet": "cat"}
            ],
        ),
    ]
)

...the Swagger example renders like this:

[
  [
    {
      "pet": "dog"
    },
    {
      "pet": "cat"
    }
  ]
]

The Expectation

I would expect the rendered example to not be nested in a list, for example:

[
  {
    "pet": "dog"
  },
  {
    "pet": "cat"
  }
]

The Solution

With the proposed changes, if a list is supplied as the value of an example, it is not wrapped in a new list.