Rename `expr::window_function::WindowFunction` to `WindowFunctionDefinition`, make structure consistent with ScalarFunction#8382

Merged

alamb merged 3 commits intoapache:mainfrom

edmondop:issue-8347

Jan 1, 2024

Commits on Dec 23, 2023

Commits on Jan 1, 2024

Merge remote-tracking branch 'apache/main' into issue-8347
alamb
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