feat!: use one configuration for all backends

[Ian2012]

Description: This PR updates the configuration to only use 1 setting entry for both backends.

This is a proposal, and depends on: openedx/event-tracking#273

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[Ian2012]

@ziafazal @bmtcril is this suitable for our requirements?

This way, switching backends would be a lot easier

[ziafazal]

@Ian2012 I'm fine with using single backend how name of that backend should not be just events I have suggested couple of names in other comment.

[bmtcril]

Just had the one request, otherwise it looks good to me

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