Move the functionality for converting a plain-text license file to an RTF file into a separate class.
- [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Add RtfConverter class Changes: https://git.openjdk.org/jdk/pull/30904/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30904&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8383162 Stats: 221 lines in 2 files changed: 141 ins; 72 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/30904.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/30904/head:pull/30904 PR: https://git.openjdk.org/jdk/pull/30904
