added server.ts file , .env.example, and types/database.ts file

[muneebkk]

Purpose

created /lib/supabase/server.ts file
created types/database.ts file

Changes

• add typed Supabase server client helper
• add generated database types for Supabase

Issue(s)

Closes #XXX

Additional Comments

Checklists

• I have thoroughly followed the practices as listed in the contributing guideline
• I have linted and formatted all of the code locally
• I have merged all the latest changes into my feature branch and fix any merge conflicts that came up
• I have thoroughly explained the changes made in the Purpose and Changes sections
• I have kept my commit history tidy by having succinct commit titles and file changes that accurately reflect my commits