[WIP] Update CMakeLists.txt to use DEFAULT_SHARED for building C library

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Update power_grid_model_c/CMakeLists.txt to use the DEFAULT_SHARED variable for building the C library. The logic should be:

• If BUILD_SHARED_LIBS is defined, DEFAULT_SHARED is empty.
• If BUILD_SHARED_LIBS is not defined, DEFAULT_SHARED is set to 'SHARED'.
• Use DEFAULT_SHARED in the add_library call for power_grid_model_c, directly in place of SHARED/STATIC, for concise code and minimal impact on parent/global build settings.

Implement this by changing only the minimum needed lines in the existing CMakeLists.txt. Do not introduce source lists if not needed. Do not set BUILD_SHARED_LIBS anywhere in the repo. Do not change logic outside power_grid_model_c/CMakeLists.txt.

Example:

if(DEFINED BUILD_SHARED_LIBS)
set(DEFAULT_SHARED "")
else()
set(DEFAULT_SHARED "SHARED")
endif()

add_library(power_grid_model_c ${DEFAULT_SHARED}
src/buffer.cpp
src/handle.cpp
src/meta_data.cpp
src/model.cpp
src/options.cpp
src/dataset_definitions.cpp
src/serialization.cpp
src/dataset.cpp
src/math_solver.cpp
)

... rest of your target setup ...

This pull request was created as a result of the following prompt from Copilot chat.

Update power_grid_model_c/CMakeLists.txt to use the DEFAULT_SHARED variable for building the C library. The logic should be:

• If BUILD_SHARED_LIBS is defined, DEFAULT_SHARED is empty.
• If BUILD_SHARED_LIBS is not defined, DEFAULT_SHARED is set to 'SHARED'.
• Use DEFAULT_SHARED in the add_library call for power_grid_model_c, directly in place of SHARED/STATIC, for concise code and minimal impact on parent/global build settings.

Implement this by changing only the minimum needed lines in the existing CMakeLists.txt. Do not introduce source lists if not needed. Do not set BUILD_SHARED_LIBS anywhere in the repo. Do not change logic outside power_grid_model_c/CMakeLists.txt.

Example:

if(DEFINED BUILD_SHARED_LIBS)
set(DEFAULT_SHARED "")
else()
set(DEFAULT_SHARED "SHARED")
endif()

add_library(power_grid_model_c ${DEFAULT_SHARED}
src/buffer.cpp
src/handle.cpp
src/meta_data.cpp
src/model.cpp
src/options.cpp
src/dataset_definitions.cpp
src/serialization.cpp
src/dataset.cpp
src/math_solver.cpp
)

... rest of your target setup ...

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