Add support active energy

[Mohammad-Tayyab-Frequenz]

This PR adds default summation formulas for AC energy metrics in component type configuration, mirroring existing power behavior and deriving defaults from the configured component IDs.

[Copilot]

Pull request overview

Adds broader default formula handling in microgrid component-type configuration so AC energy metrics get sensible defaults when not explicitly configured.

Changes:

• Extend ComponentTypeConfig.__post_init__() to populate default summation formulas for AC_ENERGY_ACTIVE, AC_ENERGY_ACTIVE_CONSUMED, and AC_ENERGY_ACTIVE_DELIVERED (and keep backward-compat handling for deprecated AC_ACTIVE_POWER).
• Update release notes to document the new defaulting behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/frequenz/gridpool/_microgrid_config.py	Adds default-formula initialization for additional AC energy metrics during config post-init.
RELEASE_NOTES.md	Documents the new default summation formulas for AC energy metrics.

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[cwasicki]

Nice, thank you!

[cwasicki]

Let's completely get rid of this, this is actually dangerous. If you prefer to break it slower can also be a separate PR.

[Mohammad-Tayyab-Frequenz]

Wouldn't this remove the support for manual formulas then?

[cwasicki]

This is adding a fallback so that if it has not been specified at this point it adds a default summing up the default CIDs. So this silently adds a formula. I think it's better to be explicit about this and fail in case we don't have a formula neither from the formula generator nor via config. Or do I misunderstand something?

[Mohammad-Tayyab-Frequenz]

Oh, got it. I was thinking we might not want to fail in that case either. But yeah, it makes sense to throw an error instead of returning potentially incorrect interpreted formulas.

[Mohammad-Tayyab-Frequenz]

I will make another PR for that then.

[shsms]

Oh that's interesting. I wonder if inverters can be used as fallback sources for energy metrics. Have you tried this already? If not, I'll do some tests. If it doesn't work, we might have to disable fallback for specific formulas. That's still part of the plan, just haven't gotten to it yet.

[Mohammad-Tayyab-Frequenz]

@shsms Sure, I would merge this PR now but we can take the fallback discussion to the relevant slack channel.
Thank you for the inputs!!