Add processor for new spans schema

[colin-sentry]

We are working on a new schema for spans, to better handle arbitrary keys (hashing), improve the sort key, etc.

This listens to the same kafka topic as the existing consumer, but puts data into the new schema.

[evanh]

This is missing tests but largely looks fine to me.

[codecov]

Test Failures Detected: Due to failing tests, we cannot provide coverage reports at this time.

❌ Failed Test Results:

Completed 415 tests with 1 failed, 413 passed and 1 skipped.

View the full list of failed tests

pytest

• Class name: tests.test_spans_api.TestSpansApi
  Test name: test_count_for_project
  
  

  No failure message available

[untitaker]

i assume storage is already merged

[untitaker]

for the test failures, run cargo install cargo-insta and cargo insta test

[getsentry-bot]

PR reverted: d60b3e6