- reenable (most) unittests
- remove unbundling of typeshed. According to upstream docs, it is meant to be bundled.

I was made package maintainer some time ago, but for this SR I would like to have a project maintainer look at the revert of unbundling typeshed first.

reenabling the unit tests to make sure further work on python-language-server and spyder works with a sane package when unpinning their dependencies. Upstream of those packages does not like to support unpinned Jedi [1, 2].

[1] https://github.com/spyder-ide/spyder/issues/11975
[3] https://github.com/palantir/python-language-server/issues/744