dep(parse-url): replace with native URL

[msimerson]

• native URL requires node 10 (previous was v8)
• fix(prettier-plugin-eslint): pin v4, v3 not compatible
• replace Travis CI with GHA

Notes

• In Critical CVE with parse-url dependency nodertc/stun#37, the author recommends replacing parse-url. I agree with him.
• CI with GitHub Actions has been tested and you can see the output over here in my fork. I updated the readme file so that if you merge this PR, the CI test badge points to the GHA CI tests in your repo.
• the CI tests automatically test against every LTS version of node.js. Currently that's node 18 & 20.
• If you have a coveralls.io account, after merging this PR coveralls will show results in your fork. For now, I've got the badge URL pointed at my fork.

CI Sample