breaking: Versionizer now versions a FastAPI app in place

[alexschimpf]

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Description

Instead of trying to hackily clone the FastAPI app and modifying the cloned app, I'm now stripping all routes from the original FastAPI app (except for docs/openapi routes, depending on params) and then modifying it in place. This will ensure that all the original FastAPI app properties are preserved properly.

[alexschimpf]

:tada: This PR is included in version 3.0.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: