FEAT: update CMakeLists.txt to add new source file and include directories

[gargsaumya]

This pull request updates the CMakeLists.txt file in the mssql_python/pybind directory to include a new source file and necessary include directories for building the ddbc_bindings module.

Build system updates:

• mssql_python/pybind/CMakeLists.txt: Added connection/connection.cpp to the ddbc_bindings module sources and included the root and connection directories in the target_include_directories to ensure proper header file resolution.

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Checklist

• Tests Passed (if applicable) : Verified building ddbc_bindings.cpp and connection.cpp using build.bat

[Copilot]

Pull Request Overview

This pull request updates the build configuration to include a new source file and additional include directories for building the ddbc_bindings module.

• Updated the add_library command to incorporate "connection/connection.cpp".
• Added the target_include_directories block to include the root and connection directories.

[gargsaumya]

The removed function will be added in pooling PR.