Increase precision of Embeddings threshold percentages to allow for 2 decimal places

[jeffpaul]

Is your enhancement related to a problem? Please describe.

Coming in from https://github.com/10up/classifai/pull/622#issuecomment-1845939931:

One other thing I was going to note that we may want to look at (probably in a separate PR at this point) is our threshold value goes from 0 to 100. As you can see in the screenshot above, we see values that are pretty close to each other, often separated by a decimal or two. It may make sense to allow more granular control in our threshold picker so you could choose something like 75.5% or 76.25%, as examples. There may also be other ways to more intuitively handle these very small differences in scores.

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