Optimize libRestuneCore memory footprint using linker version script

[tnidigan]

Changes Made:

• Introduced 'libRestuneCore.map' to enforce strict symbol scoping at the linker level ('ld --version-script').
• Explicitly whitelisted necessary globals ('RestuneParser', 'CocoTable', 'RequestQueue', etc.) while demoting all other symbols to 'local'.
• Test & Debug Compatibility (If Condition): Added conditional logic to only apply the linker script when not building tests or in debug mode. Because the version script aggressively hides internal C++ classes (like 'ClientDataManager' and 'RateLimiter'), our component tests (RestuneComponentTests) will fail to link against them. This condition ensures tests and debugging continue to work normally while optimizing the production release build.

[kartnema]

Could you a comment here, explaining the flow briefly