* Add tempo datasource, mostly copy of jaeger datasource code

* Add label to input field

* Add logo

* Remove access option from configuration

* Add white space to field label

* Add documentation

* Fix link in docs

* Update public/app/plugins/datasource/tempo/ConfigEditor.tsx

Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>

* Update public/app/plugins/datasource/tempo/QueryField.tsx

Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>

* Add data source to the docs menu

* Add simple implementation for testDatasource

* Wording updates to the docs.

Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>