Silencing Java messages in the console when `verbose = TRUE`

reprex

``` 
library(r5r)

# library(rJavaEnv)
# rJavaEnv::java_quick_install()
# rJavaEnv::java_check_version_rjava()

# build transport network
data_path <- system.file("extdata/poa", package = "r5r")
r5r_core <- setup_r5(data_path, 
                     verbose = TRUE)
```