docs: Separate "writing a plugin" from "registering an expression" in user guide, add some extra links, don't use deprecated _register_plugin #14621
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A few things:
"abi3-py38"
feature by default to avoid installation issues like pip install polars-xdt fails - macOS Sonoma 14.3.1 polars-xdt#59. Advanced users who know what they're doing can always remove itExpr.register_plugin
instead of the deprecatedExpr._register_plugin
closes #13899