Typescript: Migrate @storybook/csf-tools to strict TS

[usrrname]

Part of #22176

What I did

1. Ensure I'm using node 16
2. Ran yarn task --task compile --no-link --start-from=install
3. Change tsconfig.json compilerOptions.strict to true
4. Ran yarn check inside code/lib/csf-tools
5. Fix VSCode linter errors in 640c4a3 and af26a45
6. Fix yarn check errors

How to test

1. Ran yarn check inside code/lib/csf-tools
2. from storybook/, ran yarn run test getStorySortParameter.test.ts and yarn run test ConfigFile.test.ts to ensure tests are passing

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[kasperpeulen]

LGTM, maybe @shilman can have one more look

[usrrname]

I used ChatGPT to explain what the codeblocks were doing 😆
also, I learned that babel/parser exists! nice

[shilman]

LGTM. Thanks so much @usrrname !!! 🙏