Add restart feature

[yottahmd]

Closes #314

[codecov-commenter]

Codecov Report

Base: 85.67% // Head: 85.20% // Decreases project coverage by -0.47% ⚠️

Coverage data is based on head (d63767b) compared to base (883fa51).
Patch coverage: 67.04% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   85.67%   85.20%   -0.48%     
==========================================
  Files          46       47       +1     
  Lines        3546     3629      +83     
==========================================
+ Hits         3038     3092      +54     
- Misses        371      392      +21     
- Partials      137      145       +8     

Impacted Files	Coverage Δ
internal/runner/job.go	65.71% <0.00%> (-6.17%)	⬇️
cmd/restart.go	61.11% <61.11%> (ø)
internal/controller/controller.go	74.46% <72.72%> (-0.09%)	⬇️
internal/dag/dag.go	89.95% <86.66%> (-0.23%)	⬇️
cmd/dagu.go	75.38% <100.00%> (+0.38%)	⬆️
internal/runner/entry.go	70.90% <100.00%> (+1.09%)	⬆️

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