feat: add loader component

[arnest00]

This work adds a loader component. I added a drop commit where clicking the analyze button will make the loader appear while the calculator is working to at least get it on the page pre-implementation. If you want to look at it on its own, I replicated it on Codepen. You'll want to take a look in Firefox, Chrome, and Safari - the progress element in its indeterminate state has slightly different behavior in each browser.

Relevant links

• BLDL-21

To validate

1. Pull down feat--loader-component
2. Run npm i and npm run build
3. Load the extension into either Chrome or Firefox
4. Verify you can open the extension
5. Click on the "Analyze this page" button
6. Verify loader component appears above the button as the calculation finishes

[github-actions]

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