Add FIND_PACKAGE_ARGS support for googletest and yaml-cpp dependencies

[Copilot]

This PR adds FIND_PACKAGE_ARGS to the FetchContent_Declare calls for both googletest and yaml-cpp dependencies, enabling users to use pre-installed versions of these packages instead of always downloading and building from source.

Changes Made

• Added FIND_PACKAGE_ARGS NAMES GTest to googletest FetchContent_Declare
• Added FIND_PACKAGE_ARGS NAMES yaml-cpp to yaml-cpp FetchContent_Declare
• Updated .gitignore to properly exclude all build directories

Benefits

With these changes, CMake will now:

1. First attempt to find pre-installed versions of googletest and yaml-cpp using find_package()
2. Fall back to the existing FetchContent behavior (download and build from source) if the packages are not found
3. Maintain full backward compatibility - existing builds continue to work unchanged

Example Usage

Users can now install these dependencies system-wide and CMake will automatically use them:

# Install dependencies via package manager
sudo apt-get install libgtest-dev libyaml-cpp-dev

# Build will now use installed packages instead of downloading
mkdir build && cd build
cmake ..
make

Verification

• All existing tests pass (34/34)
• Build system successfully attempts find_package for both dependencies before falling back to FetchContent
• Verified with CMake debug output that find_package calls are made for both GTest and yaml-cpp
• Clean builds work correctly in both scenarios (with and without pre-installed packages)

This implementation provides a more flexible dependency management approach while maintaining complete backward compatibility.

Fixes #96.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.95%. Comparing base (a3647c4) to head (a4843a7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #123   +/-   ##
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  Coverage   86.95%   86.95%           
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  Files           3        3           
  Lines          23       23           
=======================================
  Hits           20       20           
  Misses          3        3           

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