[Feature request] let TUI filter by exit success

[adamchalmers]

One of my frequent problems is "which of these very similar invocations in my shell history actually worked"? Atuin lets me solve this with the CLI atuin search --exit, but I rarely ever use the CLI. It'd be very convenient if I could:

• hit ctrl+r to open the atuin TUI
• start typing my command e.g. docker build
• notice a lot of results
• think "hmm, I should find only the successful ones"
• press a key or two to filter to only successes