Add support for Oracle Coherence embedding store

[loicmathieu]

Feature description

Add support for an Oracle Coherence embedding store provider.
See https://docs.langchain4j.dev/integrations/embedding-stores/coherence

[loicmathieu]

As embedding store client can bring a lot of dependencies, a first check should be done to evaluate the added size of the plugin before adding the embedding store (size of the built plugin comparison via gradle shadowJar).