Remove forward references by using PEP 649 deferred evaluation

[padix-key]

This PR replaces forward references by standard type annotations by using the deferred evaluation of type annotations (PEP 649).

[codspeed-hq]

Merging this PR will improve performance by 12.06%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks
✅ 101 untouched benchmarks
⏩ 14 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	benchmark_match_kmer_selection[KmerTable-None]	278.3 µs	246 µs	+13.15%
⚡	benchmark_match[KmerTable-None]	327 µs	294.6 µs	+10.99%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing padix-key:no-forward-ref (94c62a8) with main (1fa1b70)}

Footnotes

1. 14 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. ↩