R1:059860047615

Always pass handles to tokenizers, not `<phid -> name>` maps

Summary: Ref T1279. Prerequisite for adding icons or other type information to tokenizers, since we don't currently have enough information to prefill them when rendering things from the server side. By passing handles in, the tokenizer can extract type information.

Test Plan:
- Searched by user in Audit.
- Sent Conpherence from profile page.
- Tried to send an empty conpherence.
- Searched Countdown by user.
- Edited CCs in Differential.