refactor: re-use database metadata between drivers for the same database

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Bencher

Report	Sun, April 21, 2024 at 00:23:10 UTC
Project	theseus-rs/rsql
Branch	refactor-metadata
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
duckdb	➖ (view plot)	4004100.000
postgres-embedded	➖ (view plot)	818350000.000
postgresql-embedded	➖ (view plot)	822930000.000
rusqlite	➖ (view plot)	263830.000
sqlite	➖ (view plot)	501850.000

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.75000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 95.83%. Comparing base (2eb8c87) to head (0926837).

Files	Patch %	Lines
rsql_drivers/src/metadata.rs	97.72%	1 Missing :warning:
rsql_drivers/src/postgres/driver.rs	0.00%	1 Missing :warning:
rsql_drivers/src/rusqlite/driver.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #123 +/- ## ========================================== - Coverage 95.94% 95.83% -0.11% ========================================== Files 87 85 -2 Lines 9618 9445 -173 ========================================== - Hits 9228 9052 -176 - Misses 390 393 +3 ```

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