[Feature Request]Open keystore file in JAR package

[holy834]

Hi,

First thank you for your great work, this project is amazing and very helpful.

While I use it in real world deployment I find that in current version BouncyCastleSslEngineSource.loadKeyStore loads keystore from File system. However some time deployment process requires us package all things in jar file. Therefore I could not use Class.getResourceAsStream and have to extract keystore files first and then load them from file system.

Now my workaround is using reflection to hack it but, could it support loading from InputStream instead of File path?