Add command to open Unity log files

[Abhinav-0311]

Fixes #29.

Summary

• Adds a new logs command that resolves Unity Editor, package manager, and player log paths for a project.
• Uses Unity Hub project args to honor a custom Editor -logFile path when configured.
• Adds platform-specific default log locations and derives player logs from ProjectSettings.asset company/product names.
• Documents the command in the README and adds unit tests for log path parsing.

Testing

• git diff --check
• Not run: dotnet test src\ucll.tests because dotnet is not installed on PATH in this environment.