feat: add GraalVM support

[klopfdreh]

This PR adds GraalVM support to snappy-java

Documentation references:

• Accessing Resources in Native Image: https://www.graalvm.org/latest/reference-manual/native-image/dynamic-features/Resources/
• Native Image Build Configuration: https://www.graalvm.org/latest/reference-manual/native-image/overview/BuildConfiguration/
• Example implementation - AWS CRT: GraalVM support with testing awslabs/aws-crt-java#749

I added the files to this specific folder as it is going to be picked up by GraalVM automatically so you don't have to use -H:ResourceConfigurationResources - see the last comments of the "Example implementation" and the link of "Native image Build Configuration"

There are no native-image.properties required.

Fixes: #429

[xerial]

Thanks. I'll ship a new version including this fix