chore: simplify main

[MartinBernstorff]

• Removes support for lazyframes
• Simplifies the main file

[codspeed-hq]

CodSpeed Performance Report

Merging #585 will improve performances by 13.34%

_{Comparing mbern_simplify_main (eab8961) with main (7377287)}

Summary

⚡ 7 improvements

Benchmarks breakdown

	Benchmark	main	mbern_simplify_main	Change
⚡	test_bench[aggregations=['max', 'mean']]	99.1 ms	51.3 ms	+93.04%
⚡	test_bench[n_features=2.0x]	142.3 ms	94.1 ms	+51.29%
⚡	test_bench[n_lookbehinds=2.0x]	142.4 ms	93.1 ms	+52.9%
⚡	test_bench[n_lookbehinds=4.0x]	229.4 ms	180.5 ms	+27.11%
⚡	test_bench[n_lookbehinds=8.0x]	402.1 ms	354.8 ms	+13.34%
⚡	test_bench[n_pred_times=2.0x]	190.4 ms	95.3 ms	+99.84%
⚡	test_bench[x]	99.1 ms	51.4 ms	+92.76%