Migrate Invitation Code Verification Module to TypeScript

[MatthewTurk247]

Problem

The current implementation of the InvitationCodeVerifier module is in JavaScript. While functional, using JavaScript lacks the type safety and developer tooling benefits that TypeScript may provide. Ambiguous source code can lead to potential runtime errors and makes the code harder to maintain and understand, especially as the project scales.

Solution

Migrate the InvitationCodeVerifier module to TypeScript in the following steps:

1. Convert all JavaScript files in the module to TypeScript.
2. Add appropriate type definitions for all functions and variables.
3. Ensure that tsconfig.json is properly set up to compile the TypeScript code.
4. Update any related documentation to reflect the change to TypeScript.
5. Ensure that all existing tests pass and adding any necessary new tests to cover TypeScript-specific scenarios.

Additional context

See #32.

Code of Conduct

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