* convert into TS

* load plugin scripts in html body

* use buildNum as a unique Id for cache busting

* add tests for caching

* fix tests

* remove the last TODO. url should be inlined with assetss server

* this logic handled by publicPathMap on the client

* cache kbn-shared-deps as well

* attempt to fix karma tests

* always run file through replace stream

* place buildHash at begining of path, include all static files

* update bundles_route tests to inject buildNum everywhere

* fix karma config to point to right prefix

* use isDist naming throughout

* explain magic number with variables

* restore replacePublicPath option from elastic#64226

* replace one more instance of replacePublicPath

* use promisify instead of bluebird + non-null assertions

* remove one more magic number

Co-authored-by: spalger <spalger@users.noreply.github.com>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>