add logIndex and transactionIndex to subscription data

[aneyzberg]

Problem

We are missing transactionIndex and logIndex data from subscriptions and registry updates. link to Pivotal Tracker #179304614

Solution

Add the data back.

Double Checks:

• [✅ ] Did you update the changelog?
• [✅ ] Any new modules need to be exported?
• [✅ ] Are new methods in the right module?
• [✅ ] Are new methods/modules in core or not (i.e. porcelain or plumbing)?
• [✅ ] Do you have good documentation on exported methods?

Change summary:

• added transactionIndex and logIndex fields to subscription and registry updated.

Note: This is currently blocking the indexer team. So this PR is against a patch branch that does not include the latest breaking changes. We will deploy a release of this patch branch once it has been approved.