feat: support function route methods field

[Skn0tt]

Part of https://github.com/netlify/pod-dev-foundations/issues/579, based on #481.

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[klavavej]

I don't see any new prose so not sure this really needs docs review

list of methods in swagger.yml looks right to me though I'm not sure where to see this in the api reference - I poked around in the deploy preview and couldn't find the new content

[Skn0tt]

Agreed, I don't think docs review is necessary for this change per se - but apparently, you're a codeowner for the file.

I had to search really deep in the reference - the change is located in https://deploy-preview-483--open-api.netlify.com/#tag/deploy/operation/createSiteDeploy, buried under a couple more collapsibles: