Make adding semicolon configurable for "Extract function"

[mjbvz]

From @davedmarketing on September 24, 2017 17:53

• VSCode Version: (1.16.1)
• OS Version: OSX 10.11.6

Steps to Reproduce:

When I use "Extract function" it automatically adds ";". I don't use ";" when writing javascript except for inline "line breaks" or in front of self-executing functions so this causes a discrepancy.

Reproduces without extensions: Yes/No

Copied from original issue: microsoft/vscode#34911

[mjbvz]

May fall within scope of #19882