Performance Benchmarking #52

Create benchmarks for solvers, mesh generators, and visualization routines. Integrate these benchmarks into the existing node.js examples. For visualization, implement an export-to-image feature to support the benchmarks.

Tasks

• Collect and store performance metrics, including runtime, peak memory usage, and result accuracy. Regarding results accuracy, we can store a reference solution, for every example, and compare the solution of some random nodes with the reference solution.
• Automate benchmark runs in CI. Extend the current workflow, which currently performs only basic runs.