Allow the rounding to be optional in integral

[elupus]

Proposed change

Allow the rounding option be optional since we now support display precision to control the number of displayed digits of a value.

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• This PR fixes or closes issue: fixes #
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[home-assistant[bot]]

Hey there @dgomes, mind taking a look at this pull request as it has been labeled with an integration (integration) you are listed as a code owner for? Thanks!

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[elupus]

We might even want to remove the option of configuring rounding fully from config flow, and just have it control display precision for yaml config?

[dgomes]

It's not just about display, it's a calculation that eventually gets exported to outside home assistant (e.g. influxDB)

[elupus]

Yes i know that.. and rounding is wrong for that too (in my opinion). Loosing precision. But it would be a semi breaking change there. So opted for making it optional instead.

[dgomes]

Again it depends a lot on the use cases :)