[Mason][mason_link] support for VSCode.

## Features

- Initialize mason in the current workspace
- Detect missing mason installation
- Automatically gets bricks when `mason.yaml` is saved
- Create new bricks
- Add bricks to the local workspace
- Add bricks globally
- Remove bricks from the local workspace
- Remove bricks globally
- Mason make w/local bricks
- Mason make w/global bricks
- YAML schema validation for `mason.yaml` and `brick.yaml` files

[mason_link]: https://github.com/felangel/mason
