Add features to create / edit new DAGs on web UI

[yottahmd]

No description provided.

[codecov-commenter]

Codecov Report

Merging #56 (63c8395) into main (f29f0ad) will increase coverage by 0.10%.
The diff coverage is 87.30%.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   82.56%   82.67%   +0.10%     
==========================================
  Files          37       37              
  Lines        2547     2603      +56     
==========================================
+ Hits         2103     2152      +49     
- Misses        322      327       +5     
- Partials      122      124       +2     

Impacted Files	Coverage Δ
internal/controller/dag.go	77.50% <50.00%> (ø)
cmd/dagu.go	58.82% <66.66%> (+0.75%)	⬆️
internal/config/loader.go	78.37% <80.00%> (+0.25%)	⬆️
internal/controller/controller.go	84.21% <88.88%> (+0.87%)	⬆️
internal/admin/routes.go	100.00% <100.00%> (ø)
internal/config/config.go	85.44% <100.00%> (ø)

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