feat: add bulk dataset support with environment variables

[nabil-Tounarti]

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[Copilot]

Pull Request Overview

This PR adds bulk dataset support with environment variables to the pre-compute system, enabling processing of multiple datasets in a single task execution. The implementation refactors dataset handling from individual fields to a unified Dataset structure.

• Creates a new Dataset structure to encapsulate dataset properties and operations
• Adds bulk processing environment variables (BULK_SIZE and BULK_DATASET_#_*)
• Refactors pre-compute arguments to use a vector of datasets instead of individual fields

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pre-compute/src/compute/utils/env_utils.rs	Adds new environment variable enums for bulk dataset support
pre-compute/src/compute/pre_compute_args.rs	Refactors to use Dataset vector and adds bulk processing logic
pre-compute/src/compute/pre_compute_app.rs	Updates to process datasets from the new structure
pre-compute/src/compute/dataset.rs	Creates new Dataset struct with download and decryption methods
pre-compute/src/compute.rs	Adds dataset module export

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