Improve Application Service Types & Add Review Entity Relation

[madisonweiss]

Description:

1. In applications.service.ts, several functions currently use the any type. This is dangerous - replace any with the correct, strongly typed definitions to improve type safety. Also, in submitApp(), follow the existing TODO to make the user dynamic.
2. Update the reviews entity: it currently has a reviewerId field. Create a proper one-to-many relationship between reviews and the user entity using TypeORM. Verify the new relationship by adding and deleting reviews through PgAdmin to ensure data integrity.

Acceptance Criteria:

• No usage of any type remains in applications.service.ts
• submitApp() dynamically handles user as intended
• One-to-many relationship between reviews and user entity is correctly implemented
• Adding and deleting reviews via PgAdmin reflects correctly in the database and respects entity relationships

Resources:

• TypeORM Documentation: https://typeorm.io/docs/relations/many-to-one-one-to-many-relations
• Crash course on database design basics (one-to-many relationships): https://www.geeksforgeeks.org/dbms/one-to-many-relationship-in-database/

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