chore: simplify implementing decorators

[andig]

Depends on #28565

Experiment to further simplify decorating interfaces while waiting for golang/go#47487

[sourcery-ai]

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[andig]

@Maschga right now we're still creating one implementation wrapper per interface and instance, for example:

type decorateVehicleChargeStateImpl struct {
	chargeState func() (api.ChargeStatus, error)
}

func (impl *decorateVehicleChargeStateImpl) Status() (api.ChargeStatus, error) {
	return impl.chargeState()
}

It would be nice if we could make them unique and global instead of repeating the code. I have started an implement package, hand-crafting those but they could really be auto-generated using a variant or part of decorate. Any chance you could take a look how we could invoce a generate-implementations as part of the implement package to pre-create all "default" interfaces that we'd need. The needed ones are simply the best of for all current decorators.

We also need a single global function per interface for creating the interface from function and decorator like https://github.com/evcc-io/evcc/pull/28576/changes#diff-efd8c72d5ba5a9182a27e6f1f9827a9a8dc11703de2c51d5fdaa38d5f9fedf25R7-R9.

Would be great if you could look into this. Maybe AI could even help?