* refactor: remove GetIsolate() calls from SetPrivate()
* refactor: remove excess GetIsolate() calls in PassValueToOtherContextInner()
* refactor: remove GetIsolate() calls from GetPrivate()
* refactor: add a v8::Isolate* local to ProxyFunctionWrapper()
* refactor: remove error_context->GetIsolate() call from PassValueToOtherContextInner()
* refactor: remove GetIsolate() call from ProxyFunctionWrapper()
* refactor: pass source and destination isolate as arg to CreateProxyForAPI()