add `fuse_config` to `init(...)`

Add a second parameter @Nullable FuseConfig fuseConfig to init:

jfuse/jfuse-api/src/main/java/org/cryptomator/jfuse/api/FuseOperations.java

Lines 523 to 525 in 99c0bbc

    
           default void init(FuseConnInfo conn) { // TODO: add @Nullable FuseConfig for libfuse3 
        
           	// no-op 
        
           }

Document in the JavaDoc that this is not set when using the libfuse2 API.

Closed with merging #18 in 8b3351a

	default void init(FuseConnInfo conn) { // TODO: add @Nullable FuseConfig for libfuse3
	// no-op
	}