Add command to execute linter on current file

[aviadb]

The linting occurs only when saving the current file.
However, some verilog files are auto-generated by scripts
or updated by version control applications.

It would be nice to have a command to execute lint on current open file
without the need to edit and save it.

[Raamakrishnan]

Will try to implement that soon

[Raamakrishnan]

@mshr-h this can be closed