Refactor CI setup and some CMake updates

[simogasp]

This pull request removes the previous CI pipeline for Windows (no cache, very slow as it has to build all dependencies every time) in favour of a new pipeline using CMake presets, vcpkg, and caching to speed up the building time. Like the previous pipeline, it does not support CUDA on Windows.

On cache it, the build time goes down from 1h to 8 mins.

Incidentally, it also introduces some minor CMake fixes and a temporary solution to support Eigen 5

Build system and dependency management modernization:

• Added vcpkg.json to formally declare project dependencies for vcpkg, simplifying cross-platform dependency management. The vcpkg.json is based on the file of the official port of cctag on vcpkg.
• Introduced CMakePresets.json with presets for building and testing in Debug/Release modes, both with and without vcpkg, enabling more reproducible and maintainable builds.

Continuous Integration (CI) improvements:

• Added a new GitHub Actions workflow (.github/workflows/build_with_vcpkg_no_cuda.yml) to build and test the project on Windows using vcpkg, with CUDA disabled. This replaces the previous, more manual Windows build job.
• Updated .github/workflows/continuous-integration.yml to ignore documentation-only changes, add permissions, and remove the legacy Windows build job in favor of the new vcpkg-based workflow. [1] [2] [3]

CMake and dependency version enforcement:

• Updated CMakeLists.txt to use a minimum Eigen3 version (3.3.9) in any configuration instead of a different version for Windows. This is more maintainable.
• Since Eigen versions older than 5 are strict in checking the version compatibility we cannot use the version range when finding Eigen. The current solution is to not ask for a version and check the found version with a clear error if the requirement is not met. This is also propagated to the Config file when CCTag is used as 3rd party [1] [2]

Target include directories cleanup:

• Cleaned up how include directories are set for the CCTag target in both CUDA and non-CUDA builds, removing unnecessary and redundant includes as we are using targets. For one, this avoid CMake errors like

INTERFACE_INCLUDE_DIRECTORIES property contains path:

"D:/a/CCTag/CCTag/vcpkg_installed/x64-windows/include"

which is prefixed in the source directory.

[1] [2]

[codacy-production]

Not up to standards ⛔

🔴 Issues 2 high

Alerts:
⚠ 2 issues (≤ 0 issues of at least minor severity)

Results:
2 new issues

Category	Results
Security	2 high

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[gemini-code-assist]

Code Review

This pull request introduces a vcpkg.json manifest and CMakePresets.json to manage dependencies and build configurations, while updating Eigen3 version requirements and cleaning up CMake include directories. The feedback recommends correcting an invalid version constraint for boost-config and moving boost-test to an optional feature in vcpkg.json. Additionally, it is advised to make the Eigen3 version checks in CMakeLists.txt and cmake/Config.cmake.in more robust by falling back to EIGEN3_VERSION if Eigen3_VERSION is undefined.

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[gemini-code-assist]

boost-test is only required for building and running the unit tests. Declaring it as a top-level mandatory dependency forces all consumers of the cctag library to download and build boost-test. Consider moving boost-test to an optional "tests" feature in vcpkg.json so that it is only built when tests are explicitly enabled.

[gemini-code-assist]

If Eigen3_VERSION is not set (which can happen with some older or alternative Find modules that set EIGEN3_VERSION or EIGEN3_VERSION_STRING instead), the VERSION_LESS comparison will compare an empty string, resulting in a false positive FATAL_ERROR even if a compatible Eigen3 version is present. To make this check robust, define a fallback variable that checks both Eigen3_VERSION and EIGEN3_VERSION before performing the comparison.

set(_Eigen3_version "${Eigen3_VERSION}")
if(NOT _Eigen3_version AND EIGEN3_VERSION)
  set(_Eigen3_version "${EIGEN3_VERSION}")
endif()
if(_Eigen3_version VERSION_LESS CCTAG_EIGEN_REQUIRED_VERSION)
  message(FATAL_ERROR "Eigen >= ${CCTAG_EIGEN_REQUIRED_VERSION} is required, found ${_Eigen3_version}")
endif()

[gemini-code-assist]

Similar to the check in CMakeLists.txt, if Eigen3_VERSION is not set by the package finder (e.g., if it sets EIGEN3_VERSION instead), this check will fail with a false positive FATAL_ERROR. Using a fallback variable ensures robustness when CCTag is consumed as a third-party package.

set(_Eigen3_version "${Eigen3_VERSION}")
if(NOT _Eigen3_version AND EIGEN3_VERSION)
  set(_Eigen3_version "${EIGEN3_VERSION}")
endif()
if(_Eigen3_version VERSION_LESS "@CCTAG_EIGEN_REQUIRED_VERSION@")
	message(FATAL_ERROR "Eigen3 >= @CCTAG_EIGEN_REQUIRED_VERSION@ is required, found ${_Eigen3_version}")
endif()