feat(meshaccesslog): add more info to body types

[slonka]

closes https://github.com/kumahq/kuma-website/issues/1538

rendered: https://deploy-preview-1739--kuma.netlify.app/docs/2.6.x/policies/meshaccesslog/#opentelemetry

Not tested manually (let me know if I should do this), based on:

• https://github.com/open-telemetry/opentelemetry-proto/issues/167
• https://github.com/open-telemetry/opentelemetry-collector/blob/7a8954f6b83851c532fc4190ee5b17c8584a2671/pdata/internal/json/attribute.go#L33-L75
• https://github.com/open-telemetry/opentelemetry-proto/issues/167
• https://github.com/open-telemetry/opentelemetry-collector/issues/1363

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