Create Input Validation Middleware

[aryang13]

Acceptance Criteria

• Make the middleware take the handler function (a Promise that resolves or rejects) for each API endpoint that is run and handled accordingly in the middleware
• Add to each endpoint:

new LambdaBuilder(router)
    .use(new InputValidator())
    .build();

Development tasks

• Do research on best input validation for different HTTP Verb types
• work in file: src/util/middleware/inputValidator.ts

Learning Opportunities

• creating a middleware function for a lambda