[WIP] Update jmx-scraper module to follow style guide

[Copilot]

• Add missing static imports as recommended by style guide
  • Add static imports for commonly used utility methods (Arrays, Collections, Objects, Locale, Level)
  • Add static imports for test assertion methods in test files
• Apply final keyword usage rules from style guide
  • Make public non-internal classes final where possible
  • Ensure fields are final where possible
• Verify class organization follows recommended order
  • Static fields (final before non-final)
  • Instance fields (final before non-final)
  • Constructors
  • Methods
  • Nested classes
• Run tests to ensure changes don't break functionality
• Apply spotless formatting to ensure code style compliance

All style guide requirements have been successfully implemented with minimal changes. The module now follows:

• Static imports for commonly used utility methods and constants
• Proper final keyword usage on public classes
• Test files use static imports for assertion methods
• All tests pass and code formatting is compliant

Fixes #393.

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