Ivan Enderlin 399862d955 test: Run tests faster with nextest. ...

> [`cargo-nextest`](https://nexte.st/index.html) is a next-generation
> test runner for Rust projects.

This patch installs and uses `nextest` to run our own tests.

Comparing `cargo test` and `cargo nextest` with hyperfine provides the
following results:

```sh
$ hyperfine 'cargo test --workspace' 'cargo nextest run --workspace && cargo test --doc'
Benchmark 1: cargo test --workspace
  Time (mean ± σ):     51.785 s ±  2.066 s    [User: 183.471 s, System: 10.563 s]
  Range (min … max):   49.151 s … 56.641 s    10 runs

Benchmark 2: cargo nextest run --workspace && cargo test --doc
  Time (mean ± σ):     44.556 s ±  0.894 s    [User: 192.213 s, System: 11.441 s]
  Range (min … max):   43.170 s … 45.762 s    10 runs
```

Benchmark 2 is 1.16 times faster than Benchmark 1.

2022-06-22 09:26:07 +02:00

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test: Run tests faster with nextest.

2022-06-22 09:26:07 +02:00