Write ADR for unifying transfer spec and constructor codepaths

**Description**
Transfer and Constructor have quite the big overlap. After the Investigation we need to write the outcome into an ADR for the final decision .

Scope:

- [x] Summarize findings in the ADR according to the required structure



**Done Criteria**
- [x] ADR written
- [x] ADR reviewed
- [x] Scope of the Epic definded
- [x] ADR ready for the planning de development