[TRA-109] Add parent subaccount websocket (backport #1463)

[mergify]

Changelist

Update socks to be able to forward messages from a single topic to multiple websocket channels.
Add V4 parent subaccounts channel and forward messages from subaccounts topic to the parent websocket channel.
Add subaccount number as a top-level value in the websocket messages forwarded to clients.

Misc:

• fixed some flakiness / issues with the message fowarding unit tests

TODO: Filtering out transfer messages from parent to a child / child to a child is not implemented.

Test Plan

Unit tests.

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
• If this PR isn't state-breaking but has changes that modify behavior in PrepareProposal or ProcessProposal, manually add the label proposal-breaking.
• If this PR is one of many that implement a specific feature, manually label them all feature:[feature-name].
• If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
• Manually add any of the following labels: refactor, chore, bug.

---

This is an automatic backport of pull request #1463 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 355d9e9 has failed:

On branch mergify/bp/release/indexer/v5.x/pr-1463
Your branch is up to date with 'origin/release/indexer/v5.x'.

You are currently cherry-picking commit 355d9e9b.
  (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:
	new file:   indexer/packages/postgres/__tests__/lib/parent-subaccount-helpers.ts
	modified:   indexer/packages/postgres/src/index.ts
	new file:   indexer/packages/postgres/src/lib/parent-subaccount-helpers.ts
	modified:   indexer/services/comlink/__tests__/lib/helpers.test.ts
	modified:   indexer/services/comlink/src/lib/helpers.ts
	modified:   indexer/services/comlink/src/request-helpers/request-transformer.ts
	modified:   indexer/services/socks/__tests__/constants.ts
	modified:   indexer/services/socks/__tests__/helpers/from-kafka-helpers.test.ts
	modified:   indexer/services/socks/__tests__/lib/message-forwarder.test.ts
	modified:   indexer/services/socks/__tests__/lib/subscriptions.test.ts
	modified:   indexer/services/socks/package.json
	modified:   indexer/services/socks/src/helpers/from-kafka-helpers.ts
	modified:   indexer/services/socks/src/helpers/message.ts
	modified:   indexer/services/socks/src/lib/constants.ts
	modified:   indexer/services/socks/src/lib/subscription.ts
	modified:   indexer/services/socks/src/types.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

[linear]

TRA-109 Add new websocket channel to subscribe to parent subaccounts