fix: only lookup up to 200 ids per request

[jonaskuske]

The /lookup endpoint can only handle up to 200 ids per request, if you send more you get 502 Bad Gateway.

This is what's happening here: #161

To avoid this error, we can split up all requested IDs into chunks of 200, then send a separate request per chunk and merge the results of the requests into a single result array again.

fix #161