feat: add option to control cycling of result list

[willnorris]

Add new cycle_results option (default: true, the current behavior), to control whether to cycle the results list when reaching the beginning or end of the list.

I find myself regularly disoriented about where I am in a list of diagnostics when I cycle back to the beginning without realizing it. I always prefer to stop when I reach the end of the list so that it's obvious that I'm at the end (like setting scroll_strategy = limit in telescope). Going back to the beginning is simple enough with normal vim movements.

[folke]

thank you