[ENH] Adds a SeriesToCollection broadcaster

[TonyBagnall]

superseeds #1244 which has got a bit entangled with other things.

Adds a BaseCollectionTransformer that takes a BaseSeriesTransformer and broadcasts it across all instances in the collection, also returning a collection. Simple first implementation for clarity.

If the series trans fit method is empty, this uses the same transformer on all instances. This complicates threading, so will defer that to a later date (it threading will always need a separate transformer for each instance to avoid interference).

[aeon-actions-bot[bot]]

Thank you for contributing to aeon

I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ]. I would have added the following labels to this PR based on the changes made: [ $\color{#41A8F6}{\textsf{transformations}}$ ], however some package labels are already present.

The Checks tab will show the status of our automated tests. You can click on individual test runs in the tab or "Details" in the panel below to see more information if there is a failure.

If our pre-commit code quality check fails, any trivial fixes will automatically be pushed to your PR unless it is a draft.

Don't hesitate to ask questions on the aeon Slack channel if you have any.

[review-notebook-app[bot]]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB