Add option to handle parameters with default as non-optional

[luqasn]

Changes

This PR introduces a new option that makes it possible to request that non-required parameters still be generated as non-optional (no question token) if they have a default value set in their schema.

This allows to generate types for certain server implementation use where the default value is injected automatically for the handling function to consume (I am working on one atm) and the signature on the handler should indicate that the value can not be undefined.

This makes it so that the default value can be derived and set by the framework from the openapi spec and does not need to be repeated by the person implementing the operation.

This an example of an implementation that leverages the new setting: henhal/openapi-ts-backend@ee87617

Fixes #2319

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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Latest commit: 83a26e9

The changes in this PR will be included in the next version bump.

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openapi-typescript	Minor
swr-openapi	Major

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[luqasn]

Test failure seems unrelated, docly have refactored their tests and moved a bunch of files: Redocly/redocly-cli@cf26d60#diff-819418d7530fd6a1220968de72601d679939eb5a01c3b9cc9e388050bd58ff77

[sacha-c]

Test failure seems unrelated, docly have refactored their tests and moved a bunch of files: Redocly/redocly-cli@cf26d60#diff-819418d7530fd6a1220968de72601d679939eb5a01c3b9cc9e388050bd58ff77

Indeed, I've address this in a separate PR a few weeks back which is awaiting review: #2522

[luqasn]

Thanks @sacha-c, I rebased on top of your merged commit and removed my fixes.

@duncanbeevers could you have a look? Or is there someone else I should ask for a review?