Paginated response (#362)

* Paginated response

* Topics

* Project files information

* Topic files

* comments

* Viewpoints

* Related topics

* Document references

* Documents

* Topic events

* Single topic events

* Comments events

* Comment events

* Write projects inline (similar to all other list services)

* Update swagger.yaml with list fixes

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Co-authored-by: Georg Dangl <[email protected]>