Extend Microcks with custom libs and code

With the recent Microcks 1.8.1 version, there’s an abundance of exciting enhancements, from improved OpenAPI references support to optimizations for seamless usage via Testcontainers . But, in my humble opinion, a standout feature demands your attention. Introduced in 1.8.0 (see #897 ) and now completed with 1.8.1 (see #966 ), Microcks brings forth a game-changer: extensibility.