Update install.sh to fix Ubuntu compilation and dependencies

[fdenzinger]

This PR updates the install.sh script to resolve the compilation and dependency errors on Ubuntu setups, as discussed in the #2 .

Changes included:

• Isolated the CUDA/C++ toolchain: Added the full toolchain (cuda-toolkit, gcc_linux-64=13) to Conda and isolated it with export CUDA_HOME=$CONDA_PREFIX to prevent conflicts with Ubuntu's system compilers.

• Added missing build dependencies: Added explicit conda install for cmake, swig, pcl>=1.13, and vtk from conda-forge so the cpp_core wrappers build correctly.

• Fixed Boost Python linker errors: Added a sed command to dynamically replace the hardcoded boost_python311 in CMakeLists.txt to match the actual Python 3.8 environment.

• Updated Git clone protocol: Switched the superpoint_transformer clone URL to HTTPS to prevent SSH permission denied errors.

• Added fail-fast & cleanup: Added set -e so the script halts immediately on failure, and a cleanup command for FRNN artifacts to prevent caching issues on repeated runs.

Fixes #2