feat: implement column metadata

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Bencher

Report	Fri, May 17, 2024 at 02:45:00 UTC
Project	theseus-rs/rsql
Branch	update-metadata
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
duckdb	➖ (view plot)	4,007,600.00
postgres-embedded	➖ (view plot)	822,250,000.00
postgresql-embedded	➖ (view plot)	834,490,000.00
rusqlite	➖ (view plot)	296,970.00
sqlite	➖ (view plot)	535,720.00

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Codecov Report

Attention: Patch coverage is 91.04143% with 80 lines in your changes are missing coverage. Please review.

Project coverage is 95.33%. Comparing base (9df700e) to head (2718b17).

Files	Patch %	Lines
rsql_drivers/src/postgresql/driver.rs	83.73%	34 Missing :warning:
rsql_drivers/src/postgresql/metadata.rs	92.85%	10 Missing :warning:
rsql_drivers/src/sqlite/metadata.rs	92.30%	10 Missing :warning:
rsql_drivers/src/sqlserver/metadata.rs	89.58%	10 Missing :warning:
rsql_drivers/src/duckdb/metadata.rs	92.30%	8 Missing :warning:
rsql_drivers/src/mysql/metadata.rs	92.52%	8 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #134 +/- ## ========================================== - Coverage 95.56% 95.33% -0.23% ========================================== Files 89 89 Lines 9889 10469 +580 ========================================== + Hits 9450 9981 +531 - Misses 439 488 +49 ```

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