[#785] persistence: feat: support concurrent execution of the same DAG

[yottahmd]

Issue: #785

[codecov]

Codecov Report

Attention: Patch coverage is 59.31255% with 509 lines in your changes missing coverage. Please review.

Project coverage is 56.52%. Comparing base (6afd63c) to head (b30a4aa).

Files with missing lines	Patch %	Lines
internal/persistence/jsondb/jsondb.go	60.55%	88 Missing and 26 partials ⚠️
internal/persistence/jsondb/record.go	61.18%	69 Missing and 23 partials ⚠️
internal/digraph/exec.go	28.57%	55 Missing ⚠️
internal/agent/agent.go	44.15%	38 Missing and 5 partials ⚠️
internal/persistence/jsondb/writer.go	50.60%	29 Missing and 12 partials ⚠️
internal/digraph/scheduler/scheduler.go	76.97%	35 Missing ⚠️
internal/client/client.go	60.46%	15 Missing and 2 partials ⚠️
internal/digraph/dag.go	25.00%	14 Missing and 1 partial ⚠️
internal/scheduler/scheduler.go	45.45%	12 Missing ⚠️
internal/digraph/condition.go	35.29%	9 Missing and 2 partials ⚠️
... and 13 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #868      +/-   ##
==========================================
+ Coverage   55.98%   56.52%   +0.53%     
==========================================
  Files          75       76       +1     
  Lines        8195     8731     +536     
==========================================
+ Hits         4588     4935     +347     
- Misses       3220     3378     +158     
- Partials      387      418      +31     

Files with missing lines	Coverage Δ
internal/client/interface.go	100.00% <ø> (ø)
internal/cmd/context.go	75.31% <100.00%> (+1.70%)	⬆️
internal/cmd/status.go	62.50% <100.00%> (ø)
internal/config/loader.go	88.00% <100.00%> (+0.03%)	⬆️
internal/digraph/executor/mail.go	32.75% <100.00%> (ø)
internal/digraph/executor/ssh.go	35.13% <100.00%> (-0.58%)	⬇️
internal/digraph/loader.go	63.80% <100.00%> (-0.66%)	⬇️
internal/digraph/template.go	28.00% <ø> (ø)
internal/logger/context.go	82.85% <100.00%> (+17.14%)	⬆️
internal/persistence/node.go	24.56% <ø> (ø)
... and 24 more

... and 2 files with indirect coverage changes

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