[ENH] Make transformers inherit TransformerMixin and add CollectionToSeriesWrapper

[MatthewMiddlehurst]

• Adds BaseTransformer inherits TransformerMixin, which removes the last of the now deprecated self._estimator_type attributes
• Adds inverse transform tag to SeriesToCollectionBroadcaster as it has the function implemented, other small changes
  • There are issues with testing this currently, as the function does not return the same series/collection format. Not going to deal with this here
• Adds a CollectionToSeriesWrapper as a counterpart to the broadcaster

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