Support 0.1% rollout in the UI

[Tymek]

Describe the feature request

Unleash should be able to work with smaller rollout, like .5%.

Background

Backend already supports 0.1% precision. I don't think it will work with 0.01%. This should be verified.

Solution suggestions

Add 0.1% precision to the inputs in strategy form.

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Internal ticket: CJUX-20

[sighphyre]

This might need a round of statistical testing across the SDKs as well. We've had problems in the past where very small rollouts didn't distribute well because of weird hash bucketing. Completing this feature might cause that all over again