Add langchain4j-embeddings-ql4 integration test module

[jamesnetherton]

What to test:

camel-quarkus-langchain4j-embeddings generating embeddings when Quarkus LangChain4j is on the classpath.

Scenarios:

• Generate embeddings via Camel route using a Quarkus LangChain4j managed embedding model
• Verify token count headers are populated correctly