feat: add sleep command

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Bencher

Report	Tue, March 26, 2024 at 15:48:33 UTC
Project	theseus-rs/rsql
Branch	add-sleep-command
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
postgresql	➖ (view plot)	798320000.000
sqlite	➖ (view plot)	484590.000

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.60%. Comparing base (4498263) to head (d7a2bb0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #81 +/- ## ========================================== + Coverage 95.54% 95.60% +0.06% ========================================== Files 59 60 +1 Lines 6601 6694 +93 ========================================== + Hits 6307 6400 +93 Misses 294 294 ```

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