Add better OpenAPI descriptions to resources/components.schemas

[johncowen]

Description

I've noticed that the descriptions for our resources/schemas in our OAS look as though they are using a generic/default message.

https://github.com/kumahq/kuma-gui/blob/276872e535539de296f70a0f8fe93096f6b4a9aa/packages/kuma-http-api/dist/components/schemas/MeshAccessLogItem.yaml#L1

It would be good to fill these out with a short single sentence description of what the policy does.

We could then surface that in various places in the GUI.

This would also be useful in the Terraform provider and docs I believe

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edit: We could also potentially use externalDocs for adding links to our doc site and have the GUI use those?

[bartsmykla]

xref. #15009