bundle the extension with webpack

[quanzhuo]

Currently , this extension vsix is nearly 10 MB, It discreased to 2MB after bundle and minify it with webpack. Please see the offical information about bundle:

Bundling Extensions
The first reason to bundle your Visual Studio Code extension is to make sure it works for everyone using VS Code on any platform. Only bundled extensions can be used in VS Code for Web environments like github.dev and vscode.dev. When VS Code is running in the browser, it can only load one file for your extension so the extension code needs to be bundled into one single web-friendly JavaScript file. This also applies to Notebook Output Renderers, where VS Code will also only load one file for your renderer extension.

In addition, extensions can quickly grow in size and complexity. They may be authored in multiple source files and depend on modules from npm. Decomposition and reuse are development best practices but they come at a cost when installing and running extensions. Loading 100 small files is much slower than loading one large file. That's why we recommend bundling. Bundling is the process of combining multiple small source files into a single file.

[gnikit]

Thanks for the PR but I think a lot of this is already in the dev branch #293 which is actually the pre-Released version in the store (the 10Mb vsix).

The problem with the size of the extension is the assets for the README, basically there is an intro GIF that takes 9.3 Mb and couldn't be compressed any more since it would lead to loss of quality.

Given that this feature has already been implemented and released (but not yet merged to master) I will be closing this PR.