Disable debug messages
I'm integrating monero-javascript into my most recent project and it's working great so far.
However these debug sync messages are spamming my logs. Is it possible to disable them?

Example:
```
Heap resize call from 16777216 to 20185088 took 0.09554499387741089 msecs. Success: true
Heap resize call from 20185088 to 24248320 took 0.0572359561920166 msecs. Success: true
Heap resize call from 24248320 to 29097984 took 0.3719410300254822 msecs. Success: true
```