Add node builders for receiver, processor, exporter

[djaglowski]

Continuation of #7026

[codecov]

Codecov Report

Base: 89.98% // Head: 89.81% // Decreases project coverage by -0.17% ⚠️

Coverage data is based on head (64d8d25) compared to base (12c782d).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7030      +/-   ##
==========================================
- Coverage   89.98%   89.81%   -0.17%     
==========================================
  Files         245      245              
  Lines       14702    14729      +27     
==========================================
  Hits        13229    13229              
- Misses       1204     1231      +27     
  Partials      269      269              

Impacted Files	Coverage Δ
service/nodes.go	3.44% <0.00%> (-1.05%)	⬇️

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[dmitryax]

LGTM. Seems like it brings the project coverage below the threshold. If would e great if we could add some coverage soon

[djaglowski]

@dmitryax, I'm happy to offer #7045 as an alternative or at least as proof that I have substantial test coverage ready. I would be quite happy to have these tests in place sooner rather than later.

[djaglowski]

Closing in favor of #7045