Set read timeout to the default value from AbstractWagon

[yihanzhen]

Create a custom ArtifactRegistryRequestInitializer that implements HttpRequestInitializer, it does two things:

• attach credentials to outbound requests
• set read timeout to outbound requests

The read timeout is set to AbstractWagon.getReadTimeout(), which has a default value of 30 minutes if not overriden by user settings.

Locally tested with uploading a big artifact and it worked.

Fix #42

[yihanzhen]

/gcbrun

[yihanzhen]

/gcbrun