Support for 10M+ row files

Our spreadsheets are running on new infrastructure! Our engineering team has built a new spreadsheet data service in Rust that loads every uploaded file fully in-memory. The spreadsheet files will live on new high-memory servers that make it possible to validate and transform files of up to 4 GB in under 1 second.
Files of up to 1,000,000 rows can be:

• Uploaded in under a minute.
• Validated in under a second.
• Auto-fixed and transformed in under a second.