Define new component type "connector"

[djaglowski]

This establishes the new component type without including anything specific about the design of connectors.

Subset of #6372

[codecov]

Codecov Report

Base: 91.07% // Head: 91.03% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (a045390) compared to base (d9b85d3).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head a045390 differs from pull request most recent head e3e50d3. Consider uploading reports for the commit e3e50d3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6577      +/-   ##
==========================================
- Coverage   91.07%   91.03%   -0.05%     
==========================================
  Files         242      242              
  Lines       14054    14070      +16     
==========================================
+ Hits        12800    12808       +8     
- Misses       1004     1012       +8     
  Partials      250      250              

Impacted Files	Coverage Δ
component/component.go	62.22% <ø> (ø)
config/connector.go	0.00% <0.00%> (ø)
config/extension.go	66.66% <0.00%> (-33.34%)	⬇️
config/exporter.go	100.00% <0.00%> (ø)
config/receiver.go	100.00% <0.00%> (ø)
config/processor.go	100.00% <0.00%> (ø)
config/settings.go

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[bogdandrutu]

For the moment skip changes to "Host" and "Factories" and follow guidance from #6578.

This way we have the interfaces also in a "not yet stable" package which will be the "/connector" package.

[djaglowski]

@bogdandrutu, I've followed #6552 as much as possible, stripped out factory code.

[bogdandrutu]

Please rebase, and use newly added "settings" to remove duplicate code, see last merged PR.

[djaglowski]

@bogdandrutu, I've rebased and switched to settings

[ringerc]

Looks like the addition of the connectors feature may have missed some needed changes in the validate subcommand. See #8866

[djaglowski]

@ringerc, please see #8721 (comment) for an explanation and proposed changes.