feat: import advanced-search module

[WenbinWL]

Summary

1. Import the full Advanced Search codebase into advanced-search/, preserving integration/unit tests, docs, WAR build, and Docker assets while dropping its standalone Gradle wrapper.
2. Wire the module into the multi-project build (settings.gradle), aligning it with the existing caom2ui toolchain.
3. Update shared components to compile on Java 11: switch TAPSearcher to tapJob.owner and declare Servlet API dependencies as compileOnly/testImplementation so the container supplies them.
4. Run ./gradlew clean build -x intTestChrome -x intTestFirefox successfully across the repo; Selenium tasks remain defined but still skipped pending environment details.
5. Added an Advanced Search section to README.md.