Add support for MOI.Interval{Float64} set

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (5e4d7f2) 94.25% compared to head (894f944) 94.34%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #399 +/- ## ========================================== + Coverage 94.25% 94.34% +0.08% ========================================== Files 4 4 Lines 957 972 +15 ========================================== + Hits 902 917 +15 Misses 55 55 ```

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