vectorstore pgvector support specify datasource host

[lizhifuabc]

pgvector support specify url\host such as
vectorstore: chroma: initialize-schema: true client: host: ${CHROMA_HOST:http://192.168.18.64} port: ${CHROMA_PORT:8000}

In my scenario, MySQL is used for business-related and pgvector is used for vectors, but PgVectorStoreAutoConfiguration directly use JdbcTemplate, hoping to be configured separately like other Chroma instead of' spring.datasource'