fix(ComponentLoader): loader leaks memory in multiple places

[JoschuaSchneider]

PR Checklist

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• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated tests.
• added/updated API documentation.
• added/updated demos.

Changes

• The ComponentLoader leaks the _componentRef, causing the entire BsDatepickerViewContainer to leak in our application.
• A second leak occurs in the _registerOutsideClick function, which fails to properly setup the _globalListener when both outsideClick and outsideEsc are set to true. This causes the first unregister function (for the outside-click) to be overwritten by the unsubscribe function for the outsideEscClick subscription.

Memory and DOM-Nodes before the change:

and after the Change: