Added specification for OpenTelemetry metric shipping

[JonasKunz]

• May the instrumentation collect sensitive information, such as secrets or PII (ex. in headers)?
  • [ ] Yes
  • [ ] Add a section to the spec how agents should apply sanitization (such as sanitize_field_names)
  • [x] No
  • [x] Why? -> The agent only collects what the user specifies, therefore I would not see sanitization as a requirement from our side. In addition PII in labels is a terrible idea anyway due to cardinality.
  • [ ] n/a
• [x] Create PR as draft
• [x] Approval by at least one other agent
• [x] Mark as Ready for Review (automatically requests reviews from all agents and PM via CODEOWNERS)
  • Remove PM from reviewers if impact on product is negligible
  • Remove agents from reviewers if the change is not relevant for them
• [ ] Approved by at least 2 agents + PM (if relevant)
• [ ] Merge after 7 days passed without objections \ To auto-merge the PR, add /schedule YYYY-MM-DD to the PR description.
• [ ] Create implementation issues through the meta issue template (this will automate issue creation for individual agents)
• [ ] If this spec adds a new dynamic config option, add it to central config.

[apmmachine]

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#### Build stats * Start Time: 2023-03-31T05:49:00.086+0000 * Duration: 5 min 41 sec