refactor: imports

[fbraza]

Here we

1. Update the build.sbt file to make the library compile in scala 2.12, 2.13 and 3.*
2. Remove and edit some redundant and missing imports

[fbraza]

🎯 Overview

This PR modernizes the build infrastructure and improves the developer experience for the scala-dfs-lib project.

✨ Key Changes

Build & CI Improvements

• Added Taskfile.yml: Use Task for cleaner build automation
  • Simple commands: task compile, task test, task clean
  • Supports all Scala versions (2.12, 2.13, 3)
  • Default task runs full pipeline
• GitHub Actions CI: New workflow (.github/workflows/ci.yml)
  • Automated testing on push/PR to master
  • Tests against all Scala versions
  • SBT dependency caching for faster builds
  • Integrated with Taskfile commands

Test Environment

• Added log4j configuration (src/test/resources/log4j.properties)
  • Reduces verbose Hadoop/MiniDFS logging during tests
  • Cleaner test output while preserving important logs
  • Better developer experience when running tests locally

Code Quality

• Import refactoring: Cleaned up and organized imports across all source files
• Cross-version compatibility: Enhanced build.sbt for better Scala 2/3 support

Cleanup

• Removed unused OpenCode GitHub workflow and agent configuration