Source code for recent versions

It seems that the source code for `com.microsoft.azure.azure-documentdb` used to be available, specifically for [1.8.0](https://github.com/Azure/azure-documentdb-java/tree/1.8.0) and earlier. Recently however, 2.4.1 has been [released](https://mvnrepository.com/artifact/com.microsoft.azure/azure-documentdb), but the source doesn't seem to be here. Am I just looking at the wrong place or did you stop doing open source?

No source file or test is identified. Start by checking the repository history and tags against the 2.4.1 Maven release, then verify whether the corresponding source is present or documented; done means the source location or an explanation of its absence is recorded.

Written by the indexing model from the issue text.