[TIMOB-26571] TiAPI: Global process object compatible with Node.js

Node has a top-level global process object which we should attempt to emulate to some degree. A large amount of it's API is not particularly relevant to us, but for compatibility reasons we should support/expose it and try to implement as much as we can that makes sense. https://nodejs.org/api/process.html Notable are: - process.arch - equivalent to Ti.Platform.architecture - process.cwd() - process.debugPort - process.hrtime([time]) - process.mainModule - process.memoryUsage() - process.nextTick(callback[, ...args]) - process.pid - process.platform - Probably equivalent to Ti.Platform.name - process.release - process.setUncaughtExceptionCaptureCallback(fn) - process.stderr - process.stdin - process.stdout - process.title - process.uptime() - process.version - Equivalent to Ti.version - process.versions