* KCL: Show beautiful Miette errors when a KCL example test fails
Background: KCL example tests are generated from the stdlib KCL examples in the `#[stdlib]` macro in derive-docs.
Problem: When these tests fail, they output a really unhelpful error message like Kcl(Semantic(KclErrorDetails { source_ranges: [156, 160, 0], message: "Expected a sketch but found array" } )).
Solution: Use miette. Now the errors highlight the KCL code that failed and show exactly what went wrong, on which line, presenting nice diagnostics that look like cargo/rustc output.
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