Add YAML support for DAG editor

[yohamta]

[codecov]

Codecov Report

Merging #459 (0f5f519) into main (4bf74aa) will decrease coverage by 0.24%.
Report is 1 commits behind head on main.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
- Coverage   79.34%   79.11%   -0.24%     
==========================================
  Files          30       30              
  Lines        3457     3476      +19     
==========================================
+ Hits         2743     2750       +7     
- Misses        571      580       +9     
- Partials      143      146       +3     

Files Changed	Coverage Δ
internal/agent/agent.go	75.32% <53.84%> (-2.84%)	⬇️
cmd/commands.go	94.14% <100.00%> (ø)
internal/scheduler/scheduler.go	85.90% <100.00%> (+0.18%)	⬆️
internal/web/http.go	72.52% <100.00%> (ø)