Add json output to list and list-depends

[sbidoul]

Closes #11

[codecov-commenter]

Codecov Report

Merging #12 (78c536f) into main (ef51949) will decrease coverage by 0.01%.
The diff coverage is 95.34%.

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   94.21%   94.20%   -0.02%     
==========================================
  Files          21       21              
  Lines         657      690      +33     
  Branches      109      114       +5     
==========================================
+ Hits          619      650      +31     
- Misses         21       22       +1     
- Partials       17       18       +1     

Impacted Files	Coverage Δ
src/manifestoo/utils.py	88.37% <85.71%> (-1.63%)	⬇️
src/manifestoo/addon.py	100.00% <100.00%> (ø)
src/manifestoo/commands/tree.py	91.78% <100.00%> (ø)
src/manifestoo/main.py	78.57% <100.00%> (+1.64%)	⬆️
src/manifestoo/manifest.py	100.00% <100.00%> (ø)

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