Measure along / within ROIs

Not sure if this is within the scope of the project, but it would be nice to be able to measure along ROIs (e.g. a "profile line" through that moves through space in one (more, eventually?) axis. Through lines, it could be a profile line. With polygons, it could be average intensity (or any other function that takes a set of pixels and returns a number), or a profile line along the circumference of the shape.

Something like this as an example of the profile line:

I worked on something like this a couple of years ago, and might give it a shot when I have the time, but I thought I'd leave this here so I could remember, and if it inspired anyone else to give it a shot since I think it'd be very useful!

issue にはファイル、テスト、エントリーポイントが記載されていません。まず、リポジトリに既存する ROI と plotting のエントリーポイントを確認し、次にラインプロファイル、ポリゴン集約、円周プロファイルが対象範囲に含まれるかを明確にしてください。サポート対象の ROI 測定とその期待される動作が明示的に定義されていれば、完了とします。