Update datasets to use API

[anthayes92]

Context: Datasets are currently downloaded by hitting the S3 bucket (via CloudFront) where the .h5 files are stored. This PR updates the way datasets are downloaded by directing download requests to the Software Cloud managed Datasets Service.

Description of the Change: The qml.data.load function now queries the Datasets API in order to download datasets.

Benefits:

• Removes the dependency on the foldermap and data_struct files, alleviating the need to manually manage them.
• Facilitates tracking dataset downloads for analytics.

Possible Drawbacks:

• Introduces network dependency for accessing the external API.

Related GitHub Issues:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.69%. Comparing base (b78565c) to head (10d2903). Report is 18 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6126 +/- ## ========================================== + Coverage 99.58% 99.69% +0.11% ========================================== Files 443 444 +1 Lines 42273 42141 -132 ========================================== - Hits 42096 42012 -84 + Misses 177 129 -48 ```

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