[MNT] Deprecation of old ShapeDTW classifier

[hadifawaz1999]

Describe the issue

After having ShapeDTW in the distance module (see #754 ) , the old ShapeDTW classifier can be deprecated given its KNN couple with ShapeDTW.

The implementation supposes that shapeDTW with knn is simply knn-dtw on transformed series, this is false.

Suggest a potential alternative/fix

When deprecation policy is back we can take care of this before releasing v0.9.0

Additional context

No response

[TonyBagnall]

we should also consider whether to deprecate all the associated transformers that are used here and no where else. I have no real strong feeling either way, but we should discuss it

[TonyBagnall]

this is done