[service] Split component.Host functionality into separate serviceHost struct

[mx-psi]

Description:

Moves service functionality related to component.Host and zpages into a new serviceHost struct. This is an internal refactor only, with the goal of more easily visualizing what it would take to eventually expose the service struct.

Link to tracking Issue: I opened this because of the discussion in #5149. I want to do internal refactors to move towards eventually exposing service. Even if we don't end up going in that route, I think this is an improvement of the code and should be merged regardless.

Testing: Amended unit tests

Documentation: n/a, internal refactor only

[codecov]

Codecov Report

Merging #5292 (1ced543) into main (2acc422) will decrease coverage by 0.00%.
The diff coverage is 74.50%.

@@            Coverage Diff             @@
##             main    #5292      +/-   ##
==========================================
- Coverage   90.57%   90.56%   -0.01%     
==========================================
  Files         189      190       +1     
  Lines       11116    11113       -3     
==========================================
- Hits        10068    10065       -3     
  Misses        826      826              
  Partials      222      222              

Impacted Files	Coverage Δ
service/service.go	42.64% <40.90%> (-10.37%)	⬇️
service/host.go	100.00% <100.00%> (ø)
service/telemetry.go	76.25% <100.00%> (ø)
service/zpages.go	70.33% <100.00%> (ø)
pdata/internal/generated_plog.go	96.65% <0.00%> (-0.07%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2acc422...1ced543. Read the comment docs.

[bogdandrutu]

LGTM, one comment

[bogdandrutu]

@mx-psi I would kindly ask you in a followup PR to split tests (make them really unit tests)... Pretty please 🙏

[mx-psi]

@mx-psi I would kindly ask you in a followup PR to split tests (make them really unit tests)... Pretty please 🙏

You mean moving the service/service_test.go tests that test the host only to a service/host_test.go file? Sure, I will do that in a follow up PR!

[bogdandrutu]

@mx-psi you are on spot :) Also may require some refactoring :))))

[mx-psi]

I have 15 things in flight that I need to tackle before going on PTO next week, so I put this on an issue so that I don't forget about it :)