refactor!: introduce Row struct to QueryResult to replace Vec

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Bencher

Report	Fri, April 5, 2024 at 18:23:21 UTC
Project	theseus-rs/rsql
Branch	driver-row-struct
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
postgres-embedded	➖ (view plot)	816890000.000
postgresql-embedded	➖ (view plot)	821010000.000
rusqlite	➖ (view plot)	264640.000
sqlite	➖ (view plot)	503070.000

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Codecov Report

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

Project coverage is 96.02%. Comparing base (320ec33) to head (b3a19a1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #107 +/- ## ========================================== + Coverage 95.96% 96.02% +0.06% ========================================== Files 76 77 +1 Lines 8245 8376 +131 ========================================== + Hits 7912 8043 +131 Misses 333 333 ```

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