Convert CLI code to TypeScript

[harmony7]

This PR updates the JavaScript source code in the CLI to TypeScript.

• Updated ESLint for TypeScript, including migrating from .eslintrc.cjs to eslint.config.mjs.
• Files in /src/rsrc/ were used as resource files during the build and have been moved to /rsrc.
• All other .js source files in /src are migrated in place to .ts
• The entry point, js-compute-runtime-cli.js, has been moved to /src/cli/js-compute-runtime-cli.js
• Set up TypeScript to transpile files in /src to /dist - this is a new build:cli step that is run as part of npm run build and had been added to CI.
• References to /js-compute-runtime-cli.js have been updated to /dist/cli/js-compute-runtime-cli.js, including package.json and a few tests
• Grouped some functions that were in separate files but had related roles by moving them together.

The goal of this is for type safety and maintainability, including ease of adding new features.

I've tested that all related tests pass and that the updated package is usable with my projects locally.

I've added LicenseRef-scancode-unicode AND MIT as an allowed license combination pair (needed fortypescript, which is a dev dependency)

[TartanLlama]

Looks like a lot of build errors: https://github.com/fastly/js-compute-runtime/actions/runs/20024236031/job/57417839369?pr=1247

[harmony7]

Thanks my bad I missed a step when updating the workflow files. I'll go check them out and fix them