Tidy namespace

[rwb27]

This PR is replaced by #121

Currently, there are lots of imports from quite deep within this library that should be easier to find. @julianstirling suggested adding a useful set of top-level objects to the top level __init__ module, so that

from labthings_fastapi.thing import Thing
from labthings_fastapi.descriptors import ThingProperty, ThingSetting
from labthings_fastapi.decorators import thing_action

could become

from labthings_fastapi import Thing, ThingProperty, ThingSetting, thing_action

It might even become a helpful convention to import labthings as lt and then use lt.Thing etc.

This feels like it should be simple, and all the symbols above work just fine. However, I have run into problems in the past when I tried to do this (specifically for labthings_fastapi.dependencies) because of circular references. This might limit how many things can usefully be exposed at top level.

Also, at the moment there is one labthings_fastapi module that is both client and server. If labthings_fastapi is installed without the server extra, i.e. it's being used only as a client over HTTP, adding these top level imports will break it - because labthings_fastapi.thing has a hard dependency on fastapi, for example. I suspect the resolution to that is to split the package into a client and server module - but I'd welcome opinions on what makes most sense.

Depends on #110

N.B. this is currently based on @julianstirling's branch for #110 to avoid merge conflicts. It should not be merged before #110.

[barecheck]

Barecheck - Code coverage report

Total: 85.75%

Your code coverage diff: 1.73% ▴

Uncovered files and lines

File	Lines
src/labthings_fastapi/client/in_server.py	69-71, 177
src/labthings_fastapi/descriptors/action.py	33, 235-236, 239, 263
src/labthings_fastapi/descriptors/property.py	21, 46, 48, 69, 71, 102-103, 226-227
src/labthings_fastapi/example_things/__init__.py	125
src/labthings_fastapi/server/__init__.py	76, 99, 124, 151, 159, 181-182
src/labthings_fastapi/thing.py	34-35, 194, 247, 288, 295

[rwb27]

This PR was marked as merged before any commits were added. It makes no changes to the code.

The branch tidy-namespace was based off the branch for #110 and was marked as merged when #110 was merged.

I will re-open a new PR for this #121.