Canonical::empty creates arrays directly instead of going through builders

[robert3005]

Gets rid of one more todo and avoids creating builders and array refs just to go back to canonical enum

[codspeed-hq]

Merging this PR will improve performance by 27.35%

⚡ 3 improved benchmarks
✅ 391 untouched benchmarks
⏩ 2052 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	take_map[(0.1, 0.1)]	1,007.5 µs	909.4 µs	+10.78%
⚡	Simulation	take_map[(0.1, 0.5)]	2.6 ms	2 ms	+27.35%
⚡	Simulation	take_map[(0.1, 1.0)]	4.2 ms	3.5 ms	+19.37%

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_{Comparing rk/empty (58d16d4) with develop (5d6a3c8)}

Footnotes

1. 2052 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩