Fix uvloop issue

[pamelafox]

Purpose

Fixes #160 and #205 by only bringing in uvicorn requirements that are necessary and including windows marker for uvloop.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Install locally, run server
• Wait for CI to finish on windows