Robust evva-components query decoding and maintenance task fields

[andreasgrill]

Summary

Querying evva-components against newer Xesar versions (MQTT API 1.50.0+) could fail, and the actual decoding error was not visible to callers. This PR makes query decoding more robust and diagnosable, and adds the new fields.

• fix: preserve the original cause in ParsingException: ParsingException gets the same constructors as the other XesarApiExceptions. All encoding and decoding sites now pass a message and the original exception, instead of an empty ParsingException().
• fix: fail queries with ParsingException instead of a timeout on decoding errors: The query listeners in queryListAsync / queryElementAsync had no error handling. A decoding error was thrown inside the MQTT message callback, the query deferred was never completed, and callers only saw a ConnectionFailedException after the request timeout.
• feat: ignore unknown enum values in optional query response fields: Enables coerceInputValues for query responses. Enum values newly added to the Xesar API now fall back to null for optional properties instead of failing the whole query. Required enums such as EvvaComponent.componentType still fail, but now with a visible cause.
• feat: add maintenanceTask and maintenanceTaskReasons to EvvaComponent: Both fields were added in Xesar MQTT API 1.50.0. maintenanceTaskReasons is a List<String>, so new reasons don't break decoding.
• build: add .sdkmanrc to pin JDK 11: Gradle 8.1.1 does not start with newer JDKs (for example 26).

The new fields are appended to the end of the EvvaComponent constructor, so existing positional calls still compile. The no-arg constructor of ParsingException is kept.

Test plan

• New unit tests for decoding with unknown fields, unknown optional enum values, unknown maintenance task reasons, the new fields, and the preserved cause
• New QueryWithUnparsableResultTest: list and element queries with an undecodable response fail with ParsingException (instead of a timeout)
• Each commit verified separately in a clean worktree (spotlessCheck plus affected tests); full suite green on the last commit (265 tests)

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