Evaluate .editorconfig for code style settings

[dsmf]

As a developer / contributor,
I want an IDE agnostic way to configure coding style settings,
so that editor settings can be directly applied across various IDEs.

(!) Please note that this story may conflict with #319. If we decide to use the google-java-format plugin instead of configuration, this story will be obsolete.

Hints / Details

While .editorconfig is not an official standard in the sense of being ratified by a standards organization, the .editorconfig file format has gained widespread adoption and serves as a de facto standard for configuring coding styles across different development environments.

• More information on .editorconfig: https://editorconfig.org/
• IntelliJ documentation on .editorconfig: https://www.jetbrains.com/help/idea/editorconfig.html
• How to export IntelliJ settings to .editorconfig file: https://www.jetbrains.com/help/idea/editorconfig.html#94ffb23f

Currently we use the following IDE specific code style settings:
https://github.com/eclipse-tractusx/item-relationship-service/tree/main/.idea/codeStyles

Outcome / Acceptance Criteria

Outcome

• Evaluation whether .editorconfig actually produces same formatting across IDEs (verify in Eclipse and maybe Visual Studio Code?).
• If evaluation is successful export settings to .editorconfig https://www.jetbrains.com/help/idea/editorconfig.html#94ffb23f
• Updated documentation

Acceptance Criteria

• Evaluation has taken place

If evaluation successful:

• Editor settings are checked in as .editorconfig file
• Documentation is updated (https://github.com/catenax-ng/tx-item-relationship-service/blob/main/CONTRIBUTING.md)
• Complete team incl POs has moved to editorConfig