[ENH] Update erp distance

[chrisholder]

Reference Issues/PRs

This pr depends on pr #332

What does this implement/fix? Explain your changes.

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

In addition, this pr updates the 'g' parameter allowing a array to be passed that allows for a different value of g per channel (the suggested way in the original paper to set g is the standard deviation of each channel for each channel).

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?

Any other comments?

PR checklist

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• The PR title starts with either [ENH], [MNT], [DOC], or [BUG] indicating whether the PR topic is related to enhancement, maintenance, documentation, or bug.
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