LoongSuite Java GenAI Utils 0.3.0

Changes

Multimodal telemetry — Add MessageContentCapable for invocation types that carry input/output messages; support blob-to-URI preprocessing via MultimodalPreUploader, modality resolution, and completion hooks for multimodal content (#28)
Multimodal upload backends — Add SLS (SlsUploader, SlsMultimodalClient) and local file uploaders; PCM audio is converted to WAV by default for CMS playback compatibility (#29)
Examples overhaul — Restructure into multi-module examples: basic-example (REST, all well-known gen_ai.operation.name values) and asr-example (WebSocket ASR → LLM → TTS voice assistant)
Documentation — Add examples learning guide, GenAI instrumentation reference, and onboarding skill under skills/genai-utils-onboarding/

<dependency>
    <groupId>com.alibaba.loongsuite</groupId>
    <artifactId>otel-util-genai</artifactId>
    <version>0.3.0</version>
</dependency>