Add max click timings & distance to `Options`

[Azorlogh]

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Moves the click timing & distance constants to the Options struct so they can be configured by users.

Note: This need came up as part of my investigation of https://github.com/mvlabat/bevy_egui/issues/302. Essentially, on some platforms we are not guaranteed to have correct timekeeping so it's useful to be able to disable the max click duration in this case.