fix: unusable views in the interactive api browser, and new filters

[mihow]

Several endpoints in the interactive API browser time out and are unusable, however their json-only equivalents do not have this issue.

For example these never load:
https://api.beluga.insectai.org/api/v2/occurrences/?limit=1&offset=1000
https://api.beluga.insectai.org/api/v2/classifications/?limit=1

But these load fine:
https://api.beluga.insectai.org/api/v2/occurrences.jsonlimit=1&offset=1000
https://api.beluga.insectai.org/api/v2/classifications.json?limit=1

It turns out this is because the interactive API view populates the full list of choices available to users for the filters. And these two endpoints had filters that triggered a long full-scan query.

This PR disables those filters. It also adds two filters to the classifications endpoint, one for Project and one for Source Image Collection, based on a user request.

Follow-up TODOs

• Use the auto-complete or another widget for the interactive API browser
• Add a default time-limit to all DB queries
• Find other endpoints with similar issues

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