Jc/zod schemas

[jcharlpretorius]

Validation with Zod and zod-prisma-types:

• Schemas are generated from Prisma models and can be manually extended or modified to omit certain fields as needed, see shared/schemas.ts
• We can add rich comments (/// triple slash comments) to models in schema.prisma to add Zod field validators on the generated schemas, also useful for customizing validation error messages
• Schemas are stored in a shared folder and can be used on both the backend and frontend
• Types can be inferred from schemas using type TmySchema = z.infer

Other changes:

• Modify scripts in backend package.json
• Updated Prisma schema and seed scripts
• Installed Prettier code formatter
• Updated Github actions workflow to install dependencies (Zod) in shared folder

[AarshShah9]

Mostly looks good! Great work, just need to resolve merge conflicts incurred due to the latest PR merge and should be good to merge :).