Use modern Go constructs

[HadrienPatte]

• Have you signed the CLA?

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Use modern Go constructs:

• replace interface{} with any (available since go1.18)
• replace 3-clause loop with range loop (available since go1.22)
• use slices package (available since go1.21)

[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
BASE	9.085 ± 0.021	9.056	9.110	1.01 ± 0.01
HEAD	9.038 ± 0.059	8.936	9.118	1.00

[letFunny]

@HadrienPatte Thanks for this and apologies for not reviewing it. At the moment we are focused on delivering some major features that will significantly improve the UX. Once we are done with those we will prioritize reviewing and merging this PR.