Add a conversion from IntervalsFold to VectorFold when the interval is a point

[Azzaare]

No description provided.

[codecov-commenter]

Codecov Report

Merging #20 (5aa6f90) into main (7e8217f) will increase coverage by 0.35%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   79.53%   79.88%   +0.35%     
==========================================
  Files           4        4              
  Lines         171      179       +8     
==========================================
+ Hits          136      143       +7     
- Misses         35       36       +1     

Impacted Files	Coverage Δ
src/intervals.jl	83.33% <66.66%> (-0.80%)	⬇️
src/common.jl	80.00% <100.00%> (+4.00%)	⬆️

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