Download-boss

- Fix CacheWrapper filectime -> filemtime

- Some bugfixes
- Rename clientRetriable params

- Added Basic and Aws auth generators
- Added Opensearch API

- Added request envelop to further customize the download action
- Change cache file naming pattern
- Made HTTPClient download retries fully customizable

- Added a demo file
- Added logging so it's obvious which wrapper / client is actually doing something
- Fixed FileCacheWrapper bug

- First version