[ENH] Refactor BinSegSegmenter to BinSegmenter

[TonyBagnall]

BinSeg is short for BinSegmenter, so the name makes no sense

[aeon-actions-bot]

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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: [ $\color{#0e8a16}{\textsf{segmentation}}$ ], however some package labels are already present.

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