Add XML command "GetLifeSpan"

[flubshi]

Adds GetLifeSpan command.

Compared to the JSON commands, this allows to request only one component_type per request.

JSON life span types always start with a lower letter, while XML compnent type always starts capitalized. I am currently not really happy with my approach of converting these types.

Runtime tested:

Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Introduced the GetLifeSpan command, allowing users to retrieve the lifespan of various device components.
  • Added DUST_CASE_HEAP to the lifespan states, enhancing event handling related to the dust case.

• Bug Fixes

  • Improved error handling for lifespan queries to ensure graceful responses for invalid XML inputs.

• Tests

  • Added unit tests for the GetLifeSpan command to validate functionality and error scenarios.