feat: add distributed locker for tus

[mfts]

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Name	Status	Preview	Comments	Updated (UTC)
papermark	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 18, 2024 5:38pm

[what-the-diff]

PR Summary

• Inclusion of Redis locker in environment configuration
  Updated the .env.example file to include settings related to management of locks in a Redis key-value store.

• Introduction of Redis lock management
  Added a new functionality in lib/files/tus-redis-locker.ts for managing locks in a Redis key-value store. This helps in better synchronization and conflict resolution during concurrent accesses and operations.

• Expansion of Redis client capabilities
  Updated our existing Redis client (in lib/redis.ts file) to accommodate the new locker client. This extends the capabilities of our Redis integration.

• Integrating new package dependency
  Our project now includes @tus/utils as a new dependency in the package.json and package-lock.json files. This package updates our toolset for handling file uploads, specifically in the Tus protocol.

• Implementing Redis locker in Tus server
  We've made changes in pages/api/file/tus/[[...file]].ts to use RedisLocker (from lib/files/tus-redis-locker.ts) as the locker for the Tus server. This makes the process of handling locks on file uploads more efficient.