feat(android): update cpp files for unpachted v8 versions

[m1ga]

just a draft PR for an unpatched v8 version: tidev/v8_titanium#57

Changes also include:

1. V8Runtime.cpp:80-110 - Fixed O(n²) string concatenation in krollLog:

• Uses std::string for accumulation (O(n))
• Only converts to V8 strings at the end for logging

2. V8Util.cpp - Added JSON.stringify caching:

• Added static jsonStringifyFunction Persistent to cache the function
• First call looks up JSON.stringify and caches it
• Subsequent calls use the cached function directly
• Updated dispose() to clean up the cached function