Update order information metaboxes

[JPry]

Changes proposed in this Pull Request:

• Update the panel label
• Move the panel to the side
• Update classes and remove extra <h3> tag
• Initial file for the customer history data
• Add the Customer history meta box
• Add the stylesheet for our metaboxes
• Create separate method for the origin column
• Tweak some code styles
• Update the order field template based on designs

Closes #61, #62.

Note: There are a few small tweaks needed, but those are awaiting some questions being answered. I wanted to get the bulk of this up for review first.

Checks:

• [x] Does your code follow the WordPress coding standards?

Detailed test instructions

Refer to the documents (P2, Figma) mentioned in #57

1. Create an Order
2. Verify that the Order information box has been updated with the design changes
3. Verify that the Customer history box has been added with the correct data

Changelog entry

[JPry]

One point to decide maybe later. Is the frontend code base will grow enough to warrant implementing sass and a way to build sass?

That's a good question. I'm not sure, as we haven't really had many styling needs yet. Since we're ultimately hoping to put this into WooCommerce core, I'm thinking that we shouldn't worry about sass unless it becomes more complex.