Indexer e2e latency round 2 (backport #1314)

[mergify]

First PR failing because kafka doesn't like undefined values for kafka message headers. Pass through the headers verbatim.

---

This is an automatic backport of pull request #1314 done by Mergify.

[mergify]

Cherry-pick of 4daa11d has failed:

On branch mergify/bp/release/indexer/v5.x/pr-1314
Your branch is up to date with 'origin/release/indexer/v5.x'.

You are currently cherry-picking commit 4daa11de.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   indexer/packages/v4-protos/src/index.ts
	new file:   indexer/packages/v4-protos/src/utils.ts
	modified:   indexer/services/ender/__tests__/helpers/indexer-proto-helpers.ts
	modified:   indexer/services/ender/src/lib/helper.ts
	modified:   indexer/services/vulcan/__tests__/handlers/order-place-handler.test.ts
	modified:   indexer/services/vulcan/__tests__/handlers/order-remove-handler.test.ts
	new file:   indexer/services/vulcan/__tests__/helpers/constants.ts
	modified:   indexer/services/vulcan/__tests__/helpers/helpers.ts
	modified:   indexer/services/vulcan/__tests__/helpers/websocket-helpers.ts
	modified:   indexer/services/vulcan/__tests__/lib/on-message.test.ts
	modified:   indexer/services/vulcan/src/handlers/handler.ts
	modified:   indexer/services/vulcan/src/handlers/order-place-handler.ts
	modified:   indexer/services/vulcan/src/handlers/order-remove-handler.ts
	modified:   indexer/services/vulcan/src/handlers/order-update-handler.ts
	modified:   indexer/services/vulcan/src/lib/on-message.ts

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   indexer/services/socks/src/lib/message-forwarder.ts

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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