GH-4289 Optimized JdbcChatMemoryRepositoryDialect#from
          #4290
        
          
      
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As mentioned in the issue, the current implementation of
JdbcChatMemoryRepositoryDialect#fromhas room for improvement in both exception handling and JDBC vendor detection logic. This PR refactors the method with the following changes:org.springframework.jdbc.support.JdbcUtils#extractDatabaseMetaDatafor extracting database metadata from thedataSource, and obtain the database vendor name from the JDBC driver, improving accuracy and robustness;Fixes #4289