Make server dependencies non-optional

[rwb27]

Currently, a labthings client can be installed with pip install labthings_fastapi and the server is installed with pip install labthings_fastapi[server]. #121 makes it possible to import Thing from the top level namespace, which will fail if we don't have the optional server dependencies.

This PR makes the server dependencies non-optional. Doing so will fix some confusion, and stop client-only installs from being broken now that Thing can be imported at top level.

In the future, we should have a separate PyPI package for the client code. I think this will be clearer for people using it, avoid confusion for people needing server functionality, and help organise the code better.

Closes #120

[barecheck]

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[julianstirling]

Yes please!

quickstart_example.sh and index.rst both need updating to not ask for [server] install. Otherwise this is ready to go.

[rwb27]

quickstart_example.sh and index.rst both need updating to not ask for [server] install. Otherwise this is ready to go.

I'm a little surprised that didn't cause the test of quickstart to fail. I guess pip will still have installed it OK, and warnings from the bash script that installs stuff don't get captured...

[rwb27]

Thanks for spotting it in the docs. That's updated now, and I have searched for [server and not found it anywhere else...

[julianstirling]

Approved. Merge at will

[julianstirling]

Sorry, unapproved... search server] too!

[julianstirling]

Rather unhelpful comment there. I was just rushing to stop a merge... pip install -e .[dev,server] in test.yml

[rwb27]

Sorry about that, and thanks for spotting it. I guess pip only warns about missing extras, so all the tests still passed (same problem as the test that installs it using the quickstart instructions).

I have done a rather more comprehensive search and I believe I've removed any mention of the server extra from the repo. I've also updated the install instructions in the README. There are annoyingly many places where there are install instructions, but hopefully pip install labthings-fastapi is not something we will have to change in the near future. I think single-sourcing that would cause more problems than it solves.