refactor: optimize metadata to only retrieve the current schema

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Bencher

Report	Sun, July 7, 2024 at 01:10:35 UTC
Project	theseus-rs/rsql
Branch	optimize-schema-metadata
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
duckdb	➖ (view plot)	7,252,700.00
postgres-embedded	➖ (view plot)	804,590,000.00
postgresql-embedded	➖ (view plot)	801,880,000.00
rusqlite	➖ (view plot)	3,552,700.00
sqlite	➖ (view plot)	3,855,400.00

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Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@fa8da7e). Learn more about missing BASE report.

Files	Patch %	Lines
rsql_drivers/src/duckdb/metadata.rs	75.00%	1 Missing :warning:
rsql_drivers/src/sqlite/metadata.rs	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #167 +/- ## ======================================= Coverage ? 94.83% ======================================= Files ? 94 Lines ? 11049 Branches ? 0 ======================================= Hits ? 10478 Misses ? 571 Partials ? 0 ```

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