Replace OpenXRHandle with std::unique_ptr

[aristarkhovNV]

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[Copilot]

Pull request overview

This PR refactors the OpenXR handle management system by replacing a custom OpenXRHandle wrapper class with standard std::unique_ptr, simplifying resource management and leveraging C++ standard library functionality.

Key changes:

• Removed custom OpenXRHandle template class and replaced it with std::unique_ptr with appropriate deleters
• Refactored helper functions to accept parameters by const reference instead of pointer
• Reorganized member initialization in tracker classes to use initializer lists
• Extracted helper functions into the anonymous namespace for better code organization

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/core/xrio/cpp/inc/xrio/headtracker.hpp	Removed explicit destructor declaration and constructor comment
src/core/xrio/cpp/inc/xrio/controllertracker.hpp	Removed explicit destructor declaration and moved hand path members earlier in class definition
src/core/xrio/cpp/headtracker.cpp	Refactored constructor to use initializer list and removed destructor implementation
src/core/xrio/cpp/controllertracker.cpp	Extracted helper functions, refactored constructor to use initializer list, and removed destructor
src/core/oxr_utils/cpp/inc/oxr_utils/oxr_funcs.hpp	Replaced OpenXRHandle with std::unique_ptr and changed function signatures to accept const references

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