getting multiple items from list of ids in single query

Instead of only Getting a single item with HTTP API, often it is required to get multiple items. Currently a single API call is required per ID, which slows pymemri down a lot. Could be implemented either in /search or /get, something like:

POST /v4/$owner_key/get_item

{
  "auth": $auth_json,
  "payload": ["$id1", "$id2", ...]
}

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