Implement Bank Connection Screen

Description

This PR implements a new screen that allows users to connect their bank accounts using the Teller API. It includes the following changes:

Created a new page named 'bank-connection.tsx' in the 'pages' directory.
Added a form in the 'bank-connection.tsx' page to collect the user's bank details.
Implemented form submission handling and made a request to the Teller API to connect the bank account.
Handled the response from the Teller API. If the connection is successful, the user is redirected to a success page. If the connection fails, an error message is displayed.
Added a new field in the 'accounts' model in the 'prisma/schema.prisma' file to store the connected bank account information.
Created a new file named 'teller.ts' in the 'lib' directory to write functions for interacting with the Teller API.
Modified the 'middleware.ts' file to add the '/bank-connection' path to the 'publicPaths' array, allowing users to access the bank connection page without being signed in.

Created 'bank-connection.tsx' page
Added form for collecting bank details
Implemented form submission handling and Teller API integration
Handled Teller API response and displayed success or error message
Added 'connectedBankAccount' field in 'accounts' model
Created 'teller.ts' file for Teller API interaction
Modified 'middleware.ts' to allow access to '/bank-connection' page without authentication

Fixes #6.

To checkout this PR branch, run the following command in your terminal:

git checkout sweep/bank-connection-screen

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