Roadmap: recipes support for sparse tibbles

[EmilHvitfeldt]

This issue is purely based on the integration part of using sparse tibbles in recipes as input/output. A different roadmap issue will be posted about having individual steps produce sparse columns.

What we need:

• recipe() to take sparse tibbles as data make sure recipe() accepts sparse tibbles #1364
• recipe() to take {Matrix} sparse matrix as data make recipe() work with sparse matrices #1367
  • turn them into sparse tibbles early
• prep() to take sparse tibbles as data test that prep() and bake() can accept sparse tibbles #1366
• prep() to take {Matrix} sparse matrix as data make prep() work with sparse matrices #1368
  • turn them into sparse tibbles early
• bake() to take sparse tibbles as data test that prep() and bake() can accept sparse tibbles #1366
• bake() to take {Matrix} sparse matrix as data make bake() work with sparse matrices #1369
  • turn them into sparse tibbles early
• Document how sparse tibbles work within a recipe document use of sparse data in recipes #1370
  • not all transformations are sparse safe

Adding all of this will give us

• standalone usage of sparse matrices in {recipes}
• everything it needs to be able to work with the rest of {tidymodels} in regards to sparse tibbles

[github-actions]

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