Implement dataloader h5ad reading in backed mode#325

Draft

sjfleming wants to merge 16 commits intomainfrom

sf-dataloader-backed

Commits on Jul 18, 2025

added backend mode to file reading (1st function)
“sambasy”
committed
bacekdn mode for the 2nd function
“sambasy”
committed
backend mode for the third function
“sambasy”
committed
backend mode for 4th function
“sambasy”
committed

Commits on Jul 28, 2025

Commits on Jul 31, 2025