Update @microsoft/api-extractor and add tsdoc.json file (#529)

Description of changes

Updates `@microsoft/api-extractor` package to latest stable version.

Also adds a `tsdoc.json` file to resolve api-extrator warnings by adding definitions for custom tags that FAST Foundation uses. The file is copied directly from FAST Foundation:

https://github.com/microsoft/fast/blob/master/packages/web-components/fast-foundation/tsdoc.json

Author: hawkticehurst