how to add include path for Verilator

[gkamendje]

I have the following in my .vimrc file:

let g:ale_verilog_verilator_options ='-I/path_to_my_rtl_dir/rtl'

However, I still get the following warnings when linting with Verilator:
cannot find file containing module: 'my_module' or Package/class 'my_package' not found, and needs to be predeclared (IEEE 1800-2023_26.3) > Importing from missing package 'my_package'