Adjust `internal/scripts/generate-coverage.sh` to use source-coverage

[elfenpiff]

Brief feature description

The current code coverage script is not yet perfectly configured to generate a branch coverage report. Follow the documentation from:

• https://doc.rust-lang.org/rustc/instrument-coverage.html
• https://rustc-dev-guide.rust-lang.org/llvm-coverage-instrumentation.html

To adjust the script so that it generates a coverage report

• for the whole iceoryx2 workspace
• for every component individually, via CLI arguments
• for the C and C++ language bindings.