gapii doesn't initialize the logger.

The logging system needs to be initialized with `GAPID_LOGGER_INIT`, but gapii doesn't call that macro. On Android this is no problem, since that macro is empty anyhow, but on desktop tracing, not calling this macro essentially disables gapii logging.

I'm not sure where to add it, I was thinking:
```
GAPID_LOGGER_INIT(LOG_LEVEL, "gapii", "logs/gapii.log");
```
in `gapii/cc/spy.cpp` in the `Spy::get` function.