adjusting test setup and adding a basic test

[sirkitree]

Relates to:

#64

Risks

Low

Background

What does this PR do?

This modifies the test runner setup for jest to be cross platform and then adds a very basic test that can be run with pnpm test. We'll want to add further testing, but this gets us to a basic working state.

What kind of change is this?

Updates (new versions of included code)

Documentation changes needed?

Testing

Detailed testing steps

1. pnpm install
2. pnpm test

You should see output similar to:

[sirkitree]

ci was failing so the last few commits here do the following:

There are two main types of issues in the build:

1. Missing file extensions in imports (due to NodeNext module resolution)
2. Type errors with BigNumber and some other dependencies

• First, modify the tsconfig.json to handle the module resolution differently
• Update the CI workflow to include testing
• Update any files using BigNumber to use the new utility file
• For the PDF.js issue, add the types
• For the youtube-dl-exec issue, update how it's imported and used.
• Update video.ts to use this wrapper instead of the direct import