Re-add state_class total to sensor

[emontnemery]

Proposed change

Re-add state_class total to sensor
Driver: Make it possible to support net energy sensors etc.

See also #55136 which adds the last_reset property back to SensorEntity

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[probot-home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (history) you are listed as a code owner for? Thanks!
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[balloob]

So is the idea for now to just keep track of sum and not do the increasing/decreasing part yet ?

[emontnemery]

Yeah, I have an implementation of it ready, but I think it makes sense to add that in a follow-up PR.