@mustimplement to highlight APIs

[guimarqu]

ping @vitornesello

Idea from https://github.com/JuliaGraphics/Graphics.jl and JuliaLang/julia#6975

[codecov]

Codecov Report

Merging #699 (619bdb1) into master (7785ff1) will increase coverage by 1.61%.
The diff coverage is 9.52%.

@@            Coverage Diff             @@
##           master     #699      +/-   ##
==========================================
+ Coverage   84.82%   86.44%   +1.61%     
==========================================
  Files          56       57       +1     
  Lines        5721     5613     -108     
==========================================
- Hits         4853     4852       -1     
+ Misses        868      761     -107     

Impacted Files	Coverage Δ
src/Algorithm/branching/interface.jl	78.57% <ø> (+46.21%)	⬆️
src/Algorithm/interface.jl	91.48% <ø> (+25.31%)	⬆️
src/Algorithm/treesearch/interface.jl	100.00% <ø> (+75.00%)	⬆️
src/Algorithm/treesearch/printer.jl	95.50% <ø> (+18.23%)	⬆️
src/ColunaBase/interface.jl	57.14% <ø> (+26.37%)	⬆️
src/ColunaBase/recordmanager.jl	85.00% <ø> (+40.26%)	⬆️
src/ColunaBase/mustimplement.jl	5.00% <5.00%> (ø)
src/Algorithm/utilities/helpers.jl	100.00% <100.00%> (ø)

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