[feat] Add `systemverilog` and more syntax blocks support

[beyond-fu]

Now it only supports verilog file, it will be very nice if systemverilog is also supported. Although I can set the filetype of *.sv to verilog, but this is not a good practice because nvim-treesitter already supports systemverilog even native vim supports the filetype of systemverilog. Moreover, It will be better if more syntax blocks are supported, such as initial, task, function and so on.

Thanks for your work!