Planner: add a meta plan handler

[andig]

Fix #24497

The meta plan handler provides sequential handling for multiple concurrent plans in a load management-restricted environment. It does so by calculating the total plan duration for all active plans and creating an optional overall plan. The overall plan is then sliced into individual plans.

TODO

• calculate meta plan
• improve calculating meta plan by step-wise combination of overlapping plans
• visualize meta plan
• Make loadpoint planner use meta plan slots

[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• Add a guard for the case when res.Loadpoints is empty before calling lo.MinBy to avoid a runtime panic on no loadpoints.
• The nested loops for overlap computation can double-count shared intervals; consider merging and summing intervals (line sweep) to get the true union duration.
• Extract the interval-union and latestStart logic into a separate helper function for clarity and to enable unit testing of the meta-plan calculations.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Add a guard for the case when res.Loadpoints is empty before calling lo.MinBy to avoid a runtime panic on no loadpoints.
- The nested loops for overlap computation can double-count shared intervals; consider merging and summing intervals (line sweep) to get the true union duration.
- Extract the interval-union and latestStart logic into a separate helper function for clarity and to enable unit testing of the meta-plan calculations.

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