Add a less-obstrusive progress bar on top of the Ferdium window

[vraravam]

Pre-flight Checklist

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4. Please ensure you've completed all of the following.

• I have read the Contributing Guidelines for this project.
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• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Description of Change

Added a new progress-bar based on https://www.npmjs.com/package/react-topbar-progress-indicator which is less obstrusive.

Motivation and Context

Fixes #239 in a hopefully better manner

Screenshots

Sorry, don't know how to capture gif in macos. Here's a screenshot

Checklist

• My pull request is properly named
• The changes respect the code style of the project (npm run prepare-code)
• npm test passes
• I tested/previewed my changes locally

Release Notes

[vraravam]

Merging this PR since I don't want to miss the nightly.

[marco-calautti]

Would you also consider simply adding an option to disable the progress bar altogether? I do not think it is very informative in most cases, since it does not show the overall page loading progress, but it seems to show the loading of different resources, which essentially results in the bar flashing, quickly going from 0% to 100%, for each resource.

[vraravam]

@marco-calautti - such a feature (to enable/disable the progress bar) at a per-service level is already implemented and has been in use for quite a few nightlies.