Parameter key 'examples' is not yet used when generating a corpus

[grebnetiew]

Describe the bug
In openapi/example.rs, for instance line 208, the example field of a parameter is used to generate a value for the corpus. There is also an examples field (plural) where one can specify multiple examples, but we don't attempt to read it.

Versions:

• OS: any
• rustc: any
• Wuppiefuzz: any at the time of writing (v1.1.0)

To Reproduce
Add an examples field to a parameter in your API and generate a corpus.

Expected behavior
The examples are used in the generated corpus.

Additional context
See #37