chore: add mocha tests launch configuration

[lujunji4113]

Description
Add Visual Studio Code launch configuration for mocha tests.

Context
Needed to easily start/attach a debugger.

Checks

• The new code matches the existing patterns and styles.
• The tests pass with yarn test.
• The linter passes with yarn lint. (Fix errors with yarn fix.)
• The relevant examples still work. (Run examples with yarn start.)
• You've added a changeset if changing functionality. (Add one with yarn changeset add.)

[changeset-bot]

⚠️ No Changeset found

Latest commit: e6253f5

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[dylans]

@lujunji4113 prettier is complaining. If you could please resolve that, I'll land it. Thanks!

[lujunji4113]

@lujunji4113 prettier is complaining. If you could please resolve that, I'll land it. Thanks!

Resolved. Thank you.