add instantiate module command

[Yushiao]

Add instantiate module command

Usage:

1. Open command palette Ctrl+Shift+P and type System Verilog: Instantiate Module
2. Choose file you want to instantiate and it will insert inst at cursor location

#17 split PR to 3 PRs (3/3)

[mshr-h]

Ok.

[skazarynau]

I have for example 100 sv files. When I type System Verilog: Instantiate Module, I see only 5 of them. How can I choose one from the other 95 files?