breaking: remove window_ops and numba dependencies

[jmoralez]

Description

Removes the dependency on window-ops and numba to achieve the following:

• Having less dependencies and thus reduce deployment sizes (llvmlite is ~130MB uncompressed).
• Being less dependent on numba supporting python versions, e.g. removing numba right now allows us to support python 3.13.
• Lean users towards using the built-in transformations, which are faster and allow us to have more information, e.g. feat: infer samples required for built-in lag transforms updates #445

Also removes the lag_transforms extra, since that was introduced during the transition from numba to coreforecast and has been empty for a while.

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[codspeed-hq]

CodSpeed Performance Report

Merging #462 will not alter performance

_{Comparing remove-numba-dep (6901257) with main (6b60a4d)}

Summary

✅ 12 untouched benchmarks