[server] Add memory share API for sharing memories via public links

[AmanRajSinghMourya]

Discription

• Add memory share feature allowing users to share memories via public links
• New database migration for memory_shares table
• Full CRUD API for memory shares (create, get, delete)
• Public API endpoints for accessing shared memories without authentication
• Token-based middleware for public memory access

Changes

• Migration: 115_create_memory_shares - creates memory_shares table
• Entity: ente/memory_share.go - types and structs for memory shares
• Repository: pkg/repo/memory_share.go - database operations
• Controller: pkg/controller/memory_share/ - business logic
• Middleware: pkg/middleware/memory_share.go - token authentication
• Private API: pkg/api/memory_share.go - authenticated endpoints
• Public API: pkg/api/public_memory_share.go - public access endpoints

Test plan

• Test creating a memory share
• Test accessing shared memory via public link
• Test deleting a memory share
• Verify token expiration works correctly

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