feat(occurrences): New ingest

This PR updates the ingest flow for Occurrences on EAP.

CHANGES:
* Moves from a "everything in event_data" model to an allowlist model.
* Unifies tags & contexts into attrs.
* Processes exceptions in a series of related arrays, rather than as a thicket of nested mappings and arrays

SEE ALSO:
* Search issues processor: https://github.com/getsentry/snuba/blob/master/snuba/datasets/processors/search_issues_processor.py
* Errors processor: https://github.com/getsentry/snuba/blob/bc66a617af47de8e0fe573c2ac17c9f378c523c1/rust_snuba/src/processors/errors.rs#L32

I tried to match the existing behavior of those processors as closely as possible.

TEST PLAN:
```
pytest -s tests/snuba/search/test_eap_occurrences.py
```

Author: thetruecpaul

src/sentry/autopilot/tasks/missing_sdk_integration.py

@@ -316,7 +316,7 @@ def run_missing_sdk_integration_detector_for_project_task(
         # Only create issues if the detection was successful
         if finish_reason == MissingSdkIntegrationFinishReason.SUCCESS:
             for integration in missing_integrations:
-                description = f"{integration.summary}\n\n" f"Learn more: {integration.docs_url}"
+                description = f"{integration.summary}\n\nLearn more: {integration.docs_url}"
 
                 logger.info(
                     "missing_sdk_integration_detector.issue_would_be_created",