[ENH] Update dtw distance

[chrisholder]

Reference Issues/PRs

This pr depends on pr #308 and pr #309

What does this implement/fix? Explain your changes.

This pr updates dtw to the new format for distances. In addition in doing so it makes optimisations for computing the distances between multiple time series.

Additionally, this pr also removes the checks for if functions are compiled to numba.

Does your contribution introduce a new dependency? If yes, which one?

What should a reviewer concentrate their feedback on?

Did you add any tests for the change?

There are two new test files that extend testing to cost matrix and alignment paths.

Any other comments?

The reason the removing of the checks if things are compiled to numba has been removed in this is pr is because previously bugs with alignment paths and cost matrix had slipped through testing when compiled to numba. This is because while numba is active bounds check is turned off and as such bugs that would normally throw an error (accessing an index out of bounds of the array) dont throw errors. This has previously allowed tests that go out of bounds slip through testing and therefore it was important to test all the new distances with numba turned on and off to ensure they are working.

PR checklist

For all contributions

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• Optionally, I've updated aeon's CODEOWNERS to receive notifications about future changes to these files.
• The PR title starts with either [ENH], [MNT], [DOC], or [BUG] indicating whether the PR topic is related to enhancement, maintenance, documentation, or bug.
• For new estimators, I've added the estimator to the online documentation.

[TonyBagnall]

went through this with chris today, looks good to me