feat(cognito): integrate OpenID Connect discovery for improved OAuth flow

[kilakewe]

Added OIDC discovery for Cognito to automatically use authentication endpoints and hosted UI domains that have been configured by the IDP in AWs.

[atinux]

I cannot push on your PR @kilakewe

Could you please run pnpm install and push again?

[kilakewe]

@atinux done

[pkg-pr-new]

Open in Stackblitz

npm i https://pkg.pr.new/atinux/nuxt-auth-utils@295

commit: c2f4bc3

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