[draft] Add lookup processor skeleton #43120
Draft
+1,606
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This is a skeleton draft PR to describe the initial scaffolding for the lookup/enrichment processor using extensions as sources, proposal described in #41816.
again, this is a draft PR with the goal of validating the proposal concept and facilitate discussions
Description
This draft defines its interfaces using open-telemetry/opentelemetry-collector#13902 as inspiration.
Link to tracking issue
First step towards implementing #41816