CLS event values sent to GA lose meaning due to rounding

[laradevitt]

This plugin converts all of the event values to integers before sending to GA, here:

    // Google Analytics metrics must be integers, so the value is rounded.
    ev: parseInt(delta),

Considering the key range for the CLS metric is 0 to 0.25 (with anything above that being "Poor"), the rounded values are meaningless.

The documentation for web-vitals suggests multiplying the value by 1000, or a larger multiplier for greater precision.

    // Google Analytics metrics must be integers, so the value is rounded.
    // For CLS the value is first multiplied by 1000 for greater precision
    // (note: increase the multiplier for greater precision if needed).
    eventValue: Math.round(name === 'CLS' ? delta * 1000 : delta),

Without the multiplier, 0.22145 is 0. With the multiplier, it is 221, which will be resolved as 0.221 by dividing the value by 1000 in our reports.

I'll submit a pull request shortly.