Refactor connection managers to shared base; add identifier quoting and DuckDB parameter support

[Dagalon]

Motivation

• Consolidate thread-safe connection management and avoid duplicated connection dictionary logic across database backends by introducing a reusable base class.
• Harden SQL generation by properly quoting identifiers to prevent injection/invalid names and make DuckDB attachment/DDL robust.
• Support parameterized queries for DuckDB and improve resource disposal semantics to avoid leaked commands/readers.

Description

• Add ConnectionManagerBase<TConnection> in Shared/ConnectionManagerBase.cs and update SqliteDB-Memory-Lib/ConnectionManager.cs and DuckDB-Memory-Lib/ConnectionManager.cs to inherit from the base and delegate connection creation via GetConnectionCore.
• Replace the DuckDB project package with DuckDB.NET.Data.Full 1.4.4 and link the shared ConnectionManagerBase.cs into both projects via the .csproj changes.
• Improve SQL safety by using DuckTools.QuoteIdentifier for database/table/column names, update DuckTools.AttachDatabase to quote aliases, and fix QueryExecutor to build quoted table names.
• Use using statements for DuckDBCommand/readers and implement parameter binding in QueryExecutor.ExecuteQryReader(...) by creating parameters via CreateParameter and normalizing names with NormalizeParameterName.
• Fix KeeperRegisterIdDataBase.DeleteRegister to locate and remove entries using FirstOrDefault with case-insensitive value comparison and guard against missing keys.

Testing

• Ran unit tests via dotnet test for the DuckDB test project including T_QuoteIdentifier_And_ParameterName_Return_Safe_Sql_Tokens, T_DeleteRegister_Ignores_Missing_Id, and T_CreateTable_Quotes_Database_And_Table_Identifiers, and they passed.
• Executed parquet table integration test T_Create_Table_From_Parquet which succeeded using the updated DuckDB library and quoted identifiers.
• Ran the new parameter test T_ExecuteQryReader_Uses_DuckDb_Parameters which validated parameterized queries and returned expected results.

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Codex Task