Bug 1893086 - Port the potential impressions framework to the suggest component

[0c0w3]

Please see https://bugzilla.mozilla.org/show_bug.cgi?id=1893086 for details. Notes:

• I'm not sure who to request review from these days, so please forward the request if you'd like!
• This leaves a keyword-matching strategy as a to-do. I think we'll want to use fts5 but I'm not sure. I'd like to do that as a follow-up.
• This modifies SuggestionQuery, which breaks most existing tests in store.rs. To prevent that from happening again in the future as much as possible, I added a SuggestionQueryBuilder and a couple macros.
• SuggestionQueryBuilder isn't exposed to consumers. Should it be? I tried adding it to the udl but that requires Arc-ifying it, which makes it a pain to use in tests (I think?). Can we do that later if it turns out to be helpful?
• Since this does modify SuggestionQuery, do I need to do something to avoid breaking mobile? I read the breaking changes info but tbh I don't understand it.

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Branch builds: add [firefox-android: branch-name] to the PR title.