feat: Dynamic Service creation

[holzweber]

What does this PR address?

Fixes #4460

Before submitting:

• [x] Does the Pull Request follow Conventional Commits specification naming? Here are GitHub's guide on how to create a pull request.
• [x] Does the code follow BentoML's code style, pre-commit run -a script has passed (instructions)?
• [x] Did you read through contribution guidelines and follow development guidelines?
• [] Did your changes require updates to the documentation? Have you updated those accordingly? Here are documentation guidelines and tips on writting docs.
• [x] Did you write tests to cover your changes?