Feature 1599 pgvector support hybrid

[hrhrng]

Issue

Closes # #1599

Change

Impeletement full-text search and hybrid search in dev.langchain4j.store.embedding.pgvector.PgVectorEmbeddingStore

General checklist

• [X] There are no breaking changes
• [X] I have added unit and integration tests for my change
• [X] I have manually run all the unit and integration tests in the module I have added/changed, and they are all green
• [X] I have manually run all the unit and integration tests in the core and main modules, and they are all green

Checklist for changing existing embedding store integration

• [X] I have manually verified that the {NameOfIntegration}EmbeddingStore works correctly with the data persisted using the latest released version of LangChain4j