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

[lukelee-sl]

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

### 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