refactor!: return exit code from evaluate

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Bencher

Report	Thu, March 28, 2024 at 20:58:57 UTC
Project	theseus-rs/rsql
Branch	exit-code
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
postgresql-embedded	➖ (view plot)	804350000.000
sqlite	➖ (view plot)	498380.000

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 58.82353% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 95.74%. Comparing base (25ac24f) to head (b04e77e).

Files	Patch %	Lines
rsql_core/src/shell/repl.rs	50.00%	5 Missing :warning:
rsql_cli/src/main.rs	71.42%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #89 +/- ## ========================================== + Coverage 95.72% 95.74% +0.01% ========================================== Files 63 63 Lines 6838 6836 -2 ========================================== - Hits 6546 6545 -1 + Misses 292 291 -1 ```

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