feat: consolidate unknown unions with well defined codecs

[ad-world]

DX-644

This is a change to consolidate unknown unions in the openapi generator. For example, if we have something like this:

t.union([WellDefinedCodec, t.unknown]) then it doesn’t make sense to pass through the t.unknown codec into the API docs, as we have our ‘best guess’ shape of the data present as well. This is a ticket to filter out these unknowns as they aren’t required, and add bloat to the generator’s output.

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:tada: This PR is included in version @api-ts/openapi-generator@4.28.0 :tada:

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:tada: This PR is included in version @api-ts/express-wrapper@1.0.28 :tada:

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:tada: This PR is included in version @api-ts/typed-express-router@1.1.8 :tada:

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:tada: This PR is included in version @api-ts/superagent-wrapper@1.2.3 :tada:

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:tada: This PR is included in version @api-ts/io-ts-http@3.1.0 :tada:

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