Add support for Python 3.10

[bkeryan]

What does this Pull Request accomplish?

Update PR pipeline to test with Python 3.10.

Upgrade pytest to support Python 3.10.

Enable in-project virtualenvs for ni-measurement-generator. By default, poetry creates virtualenvs in %USERPROFILE%\AppData\....

Why should this Pull Request be merged?

Allow customers to use Python 3.10.

Fixes #153

What testing has been done?

Ran pytest locally.

[bkeryan]

FYI, this PR is not urgent.

[bkeryan]

Now that we're working around the issue with black 22.10.0 having the wrong architecture on macOS, we're running into problems with grpcio 1.51.1 having the wrong architecture on macOS.

 Command '['/Users/runner/work/measurement-services-python/measurement-services-python/.venv/bin/python', '-m', 'pip', 'install', '--disable-pip-version-check', '--prefix', '/Users/runner/work/measurement-services-python/measurement-services-python/.venv', '--no-deps', '/Users/runner/Library/Caches/pypoetry/artifacts/2b/90/2d/f5d7acf5ce32ce2a6d2ed0f274a7110c075d38f9589b1fe13edd464bd9/grpcio-1.51.1-cp310-cp310-macosx_12_0_x86_64.whl']' returned non-zero exit status 1.

I downloaded https://files.pythonhosted.org/packages/e9/a4/2ee6a755db094ead5c705e59c42c5d0232d183d768b01326d20d580cf89b/grpcio-1.51.1-cp310-cp310-macosx_12_0_x86_64.whl and extracted cygrpc.cpython-310-darwin.so, and it has the right architecture:

% file cygrpc.cpython-310-darwin.so 
cygrpc.cpython-310-darwin.so: Mach-O 64-bit bundle x86_64

The GitHub runner has macOS 12.6, and I assume the machine is x86_64 based on the previous problem.