bundle the extension from performance

[redocrepus]

See second to last message when packaging the extension:

c:\dev\arkode>vsce package
(node:7788) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
Executing prepublish script 'npm run vscode:prepublish'...

> [email protected] vscode:prepublish
> npm run compile


> [email protected] compile
> tsc -p ./

This extension consists of 457 files, out of which 254 are JavaScript files. For performance reasons, you should bundle your extension: https://aka.ms/vscode-bundle-extension . You should also exclude unnecessary files by adding them to your .vscodeignore: https://aka.ms/vscode-vscodeignore
 DONE  Packaged: c:\dev\arkode\arkode-0.0.1.vsix (457 files, 1.5MB)