CAMEL-23117: Add test infrastructure for PostgreSQL with pgvector extension

[gnodet]

Summary

• Extends the existing camel-test-infra-postgres module to support PostgreSQL with the pgvector extension
• Adds PostgresVectorLocalContainerInfraService, PostgresVectorLocalContainerService, and PostgresVectorServiceFactory classes using the pgvector/pgvector:pg17 Docker image
• Adds POSTGRES_VECTOR_CONTAINER property constant and corresponding postgres.vector.container entry in container.properties

Usage

@RegisterExtension
static PostgresService service = PostgresVectorServiceFactory.createService();

Test plan

• Module builds successfully with mvn install -B -pl test-infra/camel-test-infra-postgres -DskipTests
• Verify pgvector container starts and exposes JDBC URL, username, password, and port
• Verify the pgvector extension is available via CREATE EXTENSION vector

[github-actions]

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