refactor: adds random port and url parsing as part oauth refactor

[chalmerlowe]

This is a draft PR for discussion/comment purposes. The changes represent a possible approach to refactoring the oauth process in response to a pending deprecation issue.

[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot https://conventionalcommits.org/