add parsed font-weight value to highlight-overlay card

[IgorKurkov]

Hi everyone!

I suggest adding the font-weight value (bold, thin, 400, 500, 900) to the highlight-overlay card if available in styles.
something like this:

It will help us to see immediately the font-weight inline without additional clicks to get the Computed-styles tab.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[IgorKurkov]

I have no idea do we have a list of reviewers here or some "steering committee" guys, @TimvdLippe sorry that I mentioned you, please take a look or forward me to the right person.
Thanks!

[TimvdLippe]

@IgorKurkov Please read the contribution guidelines: https://goo.gle/devtools-contribution-guide