This commit adds an option to the `CommonEngine` to enable performance profiling. When enabled, timings of a number of steps will be outputted in the server console.
Example:
```
********** Performance results **********
Retrieve SSG Page: 0.3ms
Render Page: 25.4ms
Inline Critical CSS: 2.3ms
*****************************************
```
To enable profiling set `enablePeformanceProfiler: true` in the `CommonEngine` options.
```ts
const commonEngine = new CommonEngine({
enablePeformanceProfiler: true
});
```
This removes the util function for express, instead the "CommonEngine" is called directly infuture before this package is final we might rename the "CommonEngine" to something else.
