[DOC] Shapelet transform notebook

[IRKnyazev]

Reference Issues/PRs

Depends on PR #2006 - notebook uses the SAST features I added in the mentioned PR. Hence the failed notebook test.

What does this implement/fix? Explain your changes.

This notebook explores all four of aeon's transforms under the context of the GunPoint problem. I use them to drive insights into the problem while explaining and comparing the algorithms themselves too.

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