[FastAPI] add /rpc/ (get) type 'multiinfo'

Kevin Morrisrequested to merge
kevr/aurweb:pu_rpc_multiinfo into pu 
    add /rpc/ (get) type 'multiinfo'

    Slightly extend upon our `info` implementation to allow
    multiple queries in one. This clones the PHP behavior of
    multiinfo.

    Signed-off-by: Kevin Morris <kevr@0cost.org>
Edited by Kevin Morris

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