refactor!: update Connection execute/query to use &mut self

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Bencher

Report	Thu, April 11, 2024 at 20:09:35 UTC
Project	theseus-rs/rsql
Branch	update-connection-trait
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
duckdb	➖ (view plot)	3799800.000
postgres-embedded	➖ (view plot)	821280000.000
postgresql-embedded	➖ (view plot)	818950000.000
rusqlite	➖ (view plot)	268120.000
sqlite	➖ (view plot)	501650.000

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Codecov Report

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

Project coverage is 95.99%. Comparing base (61abcfc) to head (0c22bd9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #112 +/- ## ======================================= Coverage 95.99% 95.99% ======================================= Files 78 78 Lines 8723 8723 ======================================= Hits 8374 8374 Misses 349 349 ```

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