test(span): add Span::is_empty unit tests

[DonIsaac]

No description provided.

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[DonIsaac]

• docs(span): enhance Span documentation #6707
• test(span): add Span::is_empty unit tests #6706 👈
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #6706 will not alter performance

_{Comparing don/10-20-test_span_add_span_is_empty_unit_tests (810d8c3) with main (6a76ea8)}

Summary

✅ 30 untouched benchmarks

[DonIsaac]

Trivial change, merging without review