chore: Change license from APL-2.0 to EPL-2.0

[rlemaitre]

🎉 License Change: From Apache License 2.0 to Eclipse Public License 2.0

📜 Summary

This pull request updates the license for the Pillars project from the Apache License 2.0 (APL-2.0) to the Eclipse Public License 2.0 (EPL-2.0).

🔄 Changes Made

1. Updated License File:

   • Replaced the content of the LICENSE file with the text of the EPL-2.0 license.
   • Added SPDX identifier for EPL-2.0.

2. Updated Source File Headers:

   • Replaced APL-2.0 headers in source files with EPL-2.0 headers.

3. Documentation Updates:

   • Updated the README file to reflect the new license.
   • Included a note in the CHANGELOG about the license change.

4. Build Configuration Updates:

   • Updated the build.sbt file to include the new license metadata.

🛠 Why This Change?

The switch to the Eclipse Public License 2.0 was made to better align with the project's long-term goals and its ecosystem. The EPL-2.0 offers stronger copyleft provisions, ensuring that derivative works under certain conditions contribute back to the open-source community.

Additionally, the EPL is a European license, which aligns more closely with the project's base and the legal frameworks of many of its contributors and users. This change reflects a preference for a license tailored to the European context and its implications.

As part of this vision, the EPL-2.0 will be the standard license for all current and future projects under the a Funktional.IO organization, ensuring consistency and clarity across the ecosystem.

👥 Community Impact

• Contributors: As part of this change, we ask all contributors to acknowledge this new license. By merging this PR, we assume contributors agree to the re-licensing of their past contributions.
• Users: If you are using Pillars under APL-2.0, please review the new license terms to ensure compliance moving forward.

⚠️ Contributor Consent

If you are a contributor to this project and do not agree with the license change, please comment on this PR or contact the maintainers directly. Contributions that cannot be re-licensed will be addressed on a case-by-case basis.

📢 Next Steps

Once this PR is merged:

• A new release of Pillars will be published under the EPL-2.0 license.
• Further communication about the change will be shared with the community.
• All other projects under the Funktional.IO organization will adopt the EPL-2.0 license over time.

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Thank you for your understanding and support as we make this important change to the project! ❤️