Remove Expr._required_attribute
#799
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The
_required_attributecheck was meant to avoid infiniteAttributeErrorrecursion. However, we can also avoid this recursion by expanding the current "_meta" check inExpr.__getattr__to throw aRuntimeErrorwhen the key is anything that starts with"_meta"(e.g. "_meta_chunk").This PR also consolidates the redundant
dask_expr._expr.Expr.__getattr__anddask_expr._core.Expr.__getattr__logic in once place. However, I can revert that change if there were two nearly-identical definitions for a reason.