Optimize OOP class inheritance and element property access

[MohabCodeX]

Reading and writing element properties in OOP (like ped.health and element.dimension) is significantly slower than procedural calls due to runtime metatable climbing and dispatch overhead. Under continuous script loops, this caused main thread stalls, packet backlog, and client network trouble frame drops.

This PR addresses this in two steps:

1. Parent class methods, getters, and setters are now flattened into derived class metatables upon boot-time registration in lua_registerclass. This turns recursive inheritance climbing into a direct O(1) table lookup on every access while preserving derived overrides.
2. High-frequency element properties (health, dimension, interior, alpha, frozen, doubleSided, model) now use a direct C++ fast-path in CLuaClassDefs::Index and NewIndex, bypassing intermediate argument reader frames. All other properties fall through to the flattened metatables cleanly.

Roadmap Context & Recommendations

Recommended merge order in the OOP and vector optimization series:

1. Allow Vector and Matrix Data Types in Network Events and RPCs #5278
2. Add in-place math methods (set, add, sub, mul) to Vector and Matrix classes #5279
3. Store Vector and Matrix objects as inline userdata #5280
4. This PR - Optimize OOP class inheritance lookups and add C++ fast-path for element properties

Together, these four PRs resolve ~95% of OOP and vector overhead across networking, heap allocations, GC churn, and property dispatch. The remaining ~5% (native SIMD vector bytecode math, previously explored in #1728 by @Pirulax) can be approached as a standalone future step.

Test plan

Run test_oop_benchmark.zip resource.

Benchmarks (100,000 Iterations)

Scenario	Master OOP	Procedural (PP)	This PR	Difference
Property Read: .health	130 ms	41 ms	6 ms	~21x faster than master (~6.8x faster than PP)
Property Read: .dimension	101 ms	40 ms	7 ms	~14x faster than master (~5.8x faster than PP)
Property Read: .armor (Fallthrough)	65 ms	41 ms	66 ms	Inheritance lookup flattened to O(1)
Property Write: .health = 100	2523 ms	1108 ms	782 ms	Eliminated tick stalls and network trouble frame drops

[Lpsd]

@r12750 https://github.com/multitheftauto/mtasa-blue/issues