feat(node): split source connector and decoder

[ngjaying]

No description provided.

[codecov]

Codecov Report

Attention: 89 lines in your changes are missing coverage. Please review.

Comparison is base (a687968) 63.07% compared to head (763f447) 63.75%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
internal/topo/planner/planner.go	65.85%	21 Missing and 7 partials ⚠️
internal/io/mock/test_source_connector.go	78.72%	10 Missing ⚠️
internal/topo/planner/planner_graph.go	75.61%	9 Missing and 1 partial ⚠️
pkg/infra/saferun.go	23.08%	10 Missing ⚠️
internal/topo/node/decode_op.go	89.89%	7 Missing and 2 partials ⚠️
internal/topo/subtopo.go	88.57%	6 Missing and 2 partials ⚠️
internal/topo/topo.go	79.49%	8 Missing ⚠️
internal/io/mqtt/mqtt_source_connector.go	89.83%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2583      +/-   ##
==========================================
+ Coverage   63.07%   63.75%   +0.68%     
==========================================
  Files         320      326       +6     
  Lines       37498    37973     +475     
==========================================
+ Hits        23651    24208     +557     
+ Misses      11708    11603     -105     
- Partials     2139     2162      +23     

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