Allow disabling of auto-search while typing

[Scottj1s]

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For larger binlogs, the lag between keypresses can be annoying. Maybe a longer delay before the auto-search kicks in, or a way to disable it entirely, requiring an Enter keypress to execute the search.

[ProTip]

It's particularly problematic for me with the Avalonia on Linux which seems to suffer from general perf issues vs the Windows build.