Add filters to pair field example

[dcousens]

This pull request adds an example of a custom GraphQL filter to the pair field type example.

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Name	Status	Preview	Updated
keystone-next-docs	✅ Ready (Inspect)	Visit Preview	Sep 8, 2022 at 5:14AM (UTC)

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[emmatown]

obligatory "I don't think this filter behavior is actually what you would want" but it's a fine illustration