examples: Run ni-python-styleguide separately for each example

[bkeryan]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

Add a dependency on ni-python-styleguide to each example. Running ni-python-styleguide from the main project treats the examples as part of the main project, which affects sorting of imports.

Update the main project's ni-python-styleguide and black configurations to exclude the examples.

Update sample_measurement's ni-python-styleguide configuration to exclude Protobuf codegen.

Update the check_examples workflow to lint the examples separately.

Why should this Pull Request be merged?

Fixes #374

What testing has been done?

PR build

[github-actions]

Test Results

       30 files  ±0       30 suites  ±0   25m 43s ⏱️ +32s
     451 tests ±0     375 ✔️ ±0       76 💤 ±0  0 ❌ ±0 
13 500 runs  ±0  9 635 ✔️ ±0  3 865 💤 ±0  0 ❌ ±0 

Results for commit 1217a6b. ± Comparison against base commit 1fdb753.

[dixonjoel]

To check my understanding, locally, when developing now, if we want to check any examples we need to change directory to the example and then run 'poetry run ni-python-styleguide lint (or fix)' there? And 'poetry run ni-python-styleguide lint' from the root will no longer lint the examples?

[bkeryan]

To check my understanding, locally, when developing now, if we want to check any examples we need to change directory to the example and then run 'poetry run ni-python-styleguide lint (or fix)' there? And 'poetry run ni-python-styleguide lint' from the root will no longer lint the examples?

Yes, that's right.

I would still like to use PoeThePoet or some Poetry workspace plugin to automate running tasks on all of the examples, but this isn't required to fix the bug.