feat(components): add notebook, cell and code editor components

[bsahitya]

Description

Web components added:

1. Code editor
2. Notebook
3. Notebook cell

What's included?

1. Code editor - Creates a monaco editor instance with the options passed
2. Notebook - Resembles a python notebook. Renders notebook cells as children.
3. Notebook cell - Resembles a python notebook cell

Test Steps

• [x] npm run storybook
• [x] Navigate to Notebook, Notebook cell & Code editor components
• [x] Play around with the properties

General Tests for Every PR

• [x] npm run start still works.
• [x] npm run lint passes.
• [x] npm run stylelint passes.
• [x] npm test passes and code coverage is not lower.
• [x] npm run build still works.

Screenshots or link to StackBlitz/Plunker

Code editor

Notebook cell

Notebook