[Maintenance] Centralize java codeformat configuration

### Relevant component

refarch-tools

### Problem description (optional)

The formatter configuration we use to format using spotless is currently located in https://github.com/it-at-m/itm-java-codeformat. It would be easier to maintain, if it is located in our centralized `refarch` repository under `java-tools`.

### Desired solution

Move and further maintain the configuration under `java-tools`.

**Important:** If possible we should make sure that the artifact names and paths do not change!

### Considered alternatives (optional)

_No response_

### Additional context (optional)

_No response_

### No duplicate

- [x] I confirm that this issue is not a duplicate

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct