Making zone management more efficient with batch DNS record updates

What this post added

Introduced batched API calls to the DNS records API, allowing for multiple DNS record operations (POST, PUT, PATCH, DELETE) in a single request. This significantly improves efficiency for managing large numbers of records. The implementation involved backend optimizations to reduce database query latency by removing redundant existence checks and introducing database batching. Propagation to the edge is handled via Quicksilver, with the caveat that edge propagation is not atomic. Also added UI support for batch deletion and proxy status changes.