Use ThermalStorageTypes for type safety

[danielfeismann]

resolves #1556

[Copilot]

Pull Request Overview

This PR introduces type safety for thermal storage types by creating specific sealed trait hierarchies to distinguish between different types of thermal storage (heat storage vs hot water storage) rather than using a generic ThermalStorage type.

Key changes:

• Introduces ThermalStorageType and StorageWithState sealed trait hierarchies with specific case classes for different storage types
• Creates ThermalResult sealed trait with specific result types for different thermal components
• Refactors ThermalGrid to use specific storage types and improve result handling with better separation of concerns

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
ThermalStorageType.scala	New file defining sealed traits for type-safe thermal storage handling
ThermalResult.scala	New file defining sealed traits for thermal result types
ThermalGrid.scala	Major refactoring to use specific storage types and improved result handling
HpInputTestData.scala	Updated parameter type from generic to specific storage type
CHANGELOG.md	Added entry documenting the type safety enhancement

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[staudtMarius]

Some questions and remarks from my side.

[staudtMarius]

LGTM.