feat(rpc): add search type handler

Kevin Morrisrequested to merge
kevr/aurweb:pu-rpc-search into pu

This commit introduces a PackageSearch-derivative class: RPCSearch. This derivative modifies callback behavior of PackageSearch to suit RPC searches, including [make|check|opt]depends by types.

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

Edited by Kevin Morris

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