Slightly larger edge lengths ensures bins cover all points

[kahaaga]

Fixes #128. Increasing bin edge widths by 1*eps() seems to be enough to avoid round-off issues in encode_as_bin.

This seems to work when tested experimentally, but a more robust solution is perhaps desired. Any suggestions are welcome.

[codecov[bot]]

Codecov Report

Merging #129 (b6c0a48) into main (30880cd) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #129   +/-   ##
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  Coverage   80.59%   80.59%           
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  Files          32       32           
  Lines         706      706           
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  Hits          569      569           
  Misses        137      137           

Impacted Files	Coverage Δ
...ities_estimators/histograms/rectangular_binning.jl	92.85% <100.00%> (ø)

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[kahaaga]

RectangularBinEncoder now takes a keyword argument that controls the size of the extra width added to ensure bin coverage. As discussed in #128 , I test this by explicitly testing the internal function encode_as_bin, which doesn't test an outcome of some method, but at least demonstrates that the problem of extra bins disappears when using a slightly larger extra width.

Are you happy with these tests, @Datseris? If so, feel free to squash and merge.