Add dropLabels to BundleTaskParameters to strip out labelled statements

[SBLMikeDemone]

This PR adds a dropLabels field to the BundleTaskParameters interface so packages can strip out certain labelled statements.

Example

If you set dropLabels to ['dev'] and your TS looks like this:

function main(): void {
    dev: if (world.isEditorWorld) {
      // Do development specific things
    }
}

The that if statement will be removed from the resulting JS.

[rlandav]

Looks good! Let me know when you want me to merge it.

[frgarc]