[tizen_window_manager] Add tizen-core-wl window backend

[JSUYA]

Introduce a WindowProxyInterface abstraction with two backends selected at runtime by WindowProxy:

• TizenCoreWlWindowProxy (tizen-core-wl) on Tizen API version >= 11.0 when the library is available
• EcoreWl2WindowProxy (ecore_wl2) otherwise, including as a fallback when tizen-core-wl cannot be loaded on 11.0+

Both backends implement WindowProxyInterface (GetGeometry/Activate/Lower) and resolve their symbols at runtime via dlopen/dlsym. TizenWindowManager constructs WindowProxy, which picks the backend by querying the platform version at startup.

[gemini-code-assist]

Code Review

This pull request introduces a WindowProxyInterface and a WindowProxy wrapper to abstract window operations, allowing the Tizen window manager to dynamically switch between EcoreWl2WindowProxy and a new TizenCoreWlWindowProxy backend depending on the platform version. Feedback on the changes suggests resolving and caching the dynamic library symbols in the constructor of TizenCoreWlWindowProxy rather than on every method call. This optimization would also ensure that if any required symbols are missing, the proxy can gracefully fall back to the EcoreWl2WindowProxy backend.

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