Use coursier repo specific authentication settings

[987Nabil]

Via the sbt the setting csrConfiguration it is possible to add not only repo specific basic auth, but also add headers to authenticate via OAuth2 for example. This is (as far as I am aware of) the only way to set headers without using a custom URL resolver.

Scala Steward should also be able to read this setting.

Related https://github.com/sbt/sbt/issues/4382

[987Nabil]

Actually #2533 should solve this.

[fthomas]

Closing since #2533 has been merged.