MGMT-16112: Add OpenAPI handler

[jhernand]

This patch adds a new /o2ims-infrastructureInventory/v1/openapi endpoint that returns the OpenAPI specification of the service.

Currently this specification only covers the metadata and the deployment manager endpoints. Other endpoints will be added later.

Related: https://issues.redhat.com/browse/MGMT-16112

[openshift-ci-robot]

@jhernand: This pull request references MGMT-16112 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.16.0" version, but no target version was set.

In response to this:

This patch adds a new /o2ims-infrastructureInventory/v1/openapi endpoint that returns the OpenAPI specification of the service.

Currently this specification only covers the metadata and the deployment manager endpoints. Other endpoints will be added later.

Related: https://issues.redhat.com/browse/MGMT-16112

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[openshift-ci]

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[danielerez]

/lgtm
Note: just wonder whether the spec can be generated from code on every change.
Maybe using huma: https://github.com/danielgtaylor/huma/blob/8f089757a73fa97636099306a6549745e1f1bb8f/docs/docs/features/openapi-generation.md?plain=1#L9