Allow configuration of max number of characters rendered of sticky scroll

[123913210]

https://github.com/microsoft/vscode/blob/main/src/vs/editor/contrib/stickyScroll/browser/stickyScrollWidget.ts#L315C13-L315C16

Please let this number be configurable so I can have a very wide sticky scroll. My use case is for with the extension https://marketplace.visualstudio.com/items?itemName=mechatroner.rainbow-csv, the CSV header sticks at the top. But with many columns, at some point I cannot see the column header anymore.