nitypes: Enable type checking with Pyright

[bkeryan]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

Enable type checking with Microsoft's type checker, Pyright, in addition to Mypy.

Why should this Pull Request be merged?

We should use both type checkers:

• Mypy is the original Python type checker and is written in Python. It is more widely used by NI's Python projects and I think it's more widely used by Python projects in general.
• Pyright is Microsoft's Python type checker and is written in TypeScript. It is integrated into the VS Code Pylance extension. Type checking with Pyright ensures that users will see the correct inferred types in VS Code.

What testing has been done?

Ran poetry run mypy and poetry run pyright locally.

[github-actions]

Test Results

   10 files  ±0     10 suites  ±0   30s ⏱️ ±0s
  573 tests ±0    573 ✅ ±0  0 💤 ±0  0 ❌ ±0 
5 730 runs  ±0  5 730 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 3eb9993. ± Comparison against base commit 13cbe86.