feat!: Using jose instead of jws

[BjornTheProgrammer]

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Fixes #493 🦕

This pull request would change to using jose, a cross-runtime library for web tokens, instead of jws. The significance of this has been described in the issue. But it would make most if not all googleapis available on platforms like Cloudfare workers.

BREAKING CHANGE:
There are possible breaking changes. The test had to be modified to comply with pkcs8 and 2048 bits long. I could make this support pkcs1 and convert it to pkcs8, but it looks like the actual private keys returned by Google are pkcs8, and this might've been an artifact of just testing. Verification should be done about that before hand. Additionally node support has been bumped to >= 15, as that is when the WebCrypto api's were added to node.

[conventional-commit-lint-gcf]

🤖 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/