feat: allow commands in rsql_core to be configured by caller

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Bencher

Report	Tue, March 12, 2024 at 16:06:27 UTC
Project	theseus-rs/rsql
Branch	configurable-commands
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
version	➖ (view plot)	48895000.000

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Codecov Report

Attention: Patch coverage is 84.42623% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 63.87%. Comparing base (3b459b1) to head (026232d).

Files	Patch %	Lines
rsql_core/src/shell/repl/impl.rs	0.00%	17 Missing :warning:
rsql_cli/src/main.rs	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6 +/- ## ========================================== + Coverage 62.45% 63.87% +1.41% ========================================== Files 25 26 +1 Lines 1489 1564 +75 ========================================== + Hits 930 999 +69 - Misses 559 565 +6 ```

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