Triage all //Future and TODO comments in modularized smart contracts service

### Problem

Many comments with //FUTURE or TODO exists in the modularized code base

Also part of this: consider all comments about specific code that's there for mono-service compatibility to see if they're still an issue, should be removed, or what.

### Solution

triage each comment and create issues to address.

### Alternatives

_No response_
```[tasklist]
### Tasks
- [ ] https://github.com/hashgraph/hedera-services/issues/14652
- [ ] https://github.com/hashgraph/hedera-services/issues/14658
- [ ] https://github.com/hashgraph/hedera-services/issues/14661
- [ ] https://github.com/hashgraph/hedera-services/issues/14679
```

Start by inspecting the modularized smart contracts service for //FUTURE, TODO, and mono-service compatibility comments, then review the referenced issues 14652, 14658, 14661, and 14679. Done means every relevant comment has been triaged and follow-up issues have been created where needed.

Written by the indexing model from the issue text.