Windows: Use a high resolution waitable timer

[alexheretic]

• Use a high resolution waitable timer when available (>= Windows 10, version 1803).
• Replace winapi with windows-sys dependency.

The mean sleep accuracy is much better, but occasionally high-res waits still take ~1ms :(

$ cargo run --bin native_sleep_accuracy --release
==> sleep 1ns
average: 2.0µs, best: 1.3µs, worst: 13.9µs
==> sleep 1µs
average: 446.7µs, best: 2.3µs, worst: 725.8µs
==> sleep 1ms
average: 1.775ms, best: 1.502ms, worst: 2.012ms

Performance is poor under high load.

$ cargo run --bin native_sleep_accuracy --release -- load
Simulating 16 thread load
==> sleep 1ns
average: 39.3µs, best: 1.8µs, worst: 36.8ms
==> sleep 1µs
average: 14.9ms, best: 2.1µs, worst: 46.9ms
==> sleep 1ms
average: 16.025ms, best: 2.004ms, worst: 30.071ms

But this was also true before, this should be an improvement overall.

resolves #16