Granular logging support

## Feature
There doesn't seem a way to toggle logging properly. I am getting some warnings about a missing font, but I'd like to be able to mute them or better pipe them into winston (for example).

## Steps to Reproduce
```js
var Canvas = require('canvas');
var canvas = Canvas.createCanvas(200, 200);
var ctx = canvas.getContext('2d');
ctx.font = '200px somemissingfont'
```

## Your Environment
* Version of node-canvas: canvas@2.8.0
* Environment: Node 14.15.5 on Windows 11