server: accept at most 20 vtxos ids per post recovery call

lucarequested to merge
luca/eng-601-recovery-vtxo-ids into master
  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

Before this MR, a client could post as many VTXOs ids as it wanted to the server. Now the server would only accept up to 20 at a time.

Edited by luca

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