Add Pyright to dev deps

[ZoogieZork]

Description

Adds Pyright to the dev dependencies in the Pipfiles.

Note

This only adds the "pyright" command-line tool. Normally in VSCode, Pyright inherits its configuration from Pylance, so to get the same results on the command-line we will need to update pyproject.toml to match the settings. That effort is still a work-in-progress, so this PR just adds Pyright to the deps for now.

Motivation and Context

Allows us to run Pyright from the command-line and ensure that we don't have any dependency conflicts.

How Has This Been Tested?

Tested running Pyright locally, e.g.:

cd backend/engine
pyright .

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation change

Checklist

• My code follows conforms to the coding standards.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.