WIP: Add stricter `Query` types

[marionebl]

• [ ] Sync on testing approach
• [ ] Create a basic type test suite for QueryBuilder and Query
• [ ] Implement stricter types

This change is 

[marionebl]

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test-d/query.test-d.ts, line 4 at r1 (raw file):

Previously, marionebl (Mario Nebl) wrote…

> Knowing nothing about tsd, should these tests be grouped into suites with describe or some such? I think there is no convention established around this as `tsd` is a pretty nice tool. The `test` function wrappers I use here are not used by the tool in any way, I just use them to provide a description. We could achieve the same thing via comments if you prefer, although I like the logical grouping the current variant established.

nice niche