feat: add verilog support

[chuanseng-ng]

Summary

• Add verilog/system-verilog basic support in parser.py
  • Support module and interface declaration
  • Support package identifier

Scope

• Verilog file-type (*.v, *.vh)
• System-verilog file-type (*.sv, *.svh)
• Packages (*.pkg)

Test

• Add Verilog fixtures
• Add Verilog tests in multilang.py

QA status

• New tests passed via pytest
• Ruff clean for modified points

Future support

• Port & signal tracing