feat: Migrate Session.controller.js to typescript

[Piyushrathoree]

Fixes #3957

Changes:

• Migrated server/controllers/session.controller.js to exactly matching TS file.
• Created CreateSessionRequestBody, CreateSessionResponseBody, GetSessionResponseBody, and DestroySessionResponseBody types in server/types/session.ts.
• Installed @types/express-session as a devDependency to allow the global Express Request object to understand req.session.destroy().

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• has no typecheck errors (npm run typecheck)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123
• meets the standards outlined in the accessibility guidelines