verilog: Add filename to vlog linter output

[patrick96]

I have customized the options for vlog to lint all my verilog files because files depend on each other. But now the warnings in other files are always displayed in the current buffer.

For that reason I have extended the handler to also match the filename and include it in the output.

./run-tests works fine and it also works in my project now.

[stale]

This pull request has been automatically marked as stale because it has not been updated recently. Make sure to write tests and document your changes. See :help ale-dev for information on writing tests.
If your pull request is good to merge, bother w0rp or another maintainer again, and get them to merge it.

[patrick96]

@w0rp Is there anything that I missed in this PR?

[w0rp]

Cheers! 🍻