🚀 Feature: Allow specifying a CODECOV_TOKEN

[JoshuaKGoldberg]

Bug Report Checklist

• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

Following the, ah, unexpected work around #1303, I've started populating a CODECOV_TOKEN in my repos:

create-typescript-app/.github/workflows/ci.yml

Lines 68 to 71 in 1d09b76

	- env:
	CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
	if: always()
	uses: codecov/codecov-action@v3

I'll want to add this in as an option so that template consumers -including my other repos- can have it be set for them as part of templating.

Additional Info

I don't think this needs to be done by default for all users. I keep getting 429s from the Codecov service because I have dozens of repos. Most people don't need this by default and wouldn't benefit from having the getting-started steps also ask them to set this up.

That being said, it would be a nice followup to see if that token can be made automatically through the API...

💖