Duplicate mutable reference to runtime

What

Use Arc<Mutex<_>> for multiple ownership of the mutable reference to runtime that the kernel entry function provides.

Why

Implementing the Database trait for revm requires ownership (of a mutable reference at least) the interface to kernel storage

How

By cloning the Arc<Mutex>, for the evm runner, and using the original for debug messages

Manually Testing

From the riscv/revm run make build. Then from riscv/scripts run ./revm-bench -t 100 or ./revm-bench -t 10000 -sn

As a quick check there should be no runtime errors when running make run-revm from the riscv directory

Benchmarking

	riscv	native
Benchmark Machine	100.017 TPS	7951.383 TPS
13th Gen Intel(R) Core(TM) i7-13700HX	139.252 TPS	9042.070 TPS

Tasks for the Author

• Link all Linear issues related to this MR using magic words (e.g. part of, relates to, closes).
• Eliminate dead code and other spurious artefacts introduced in your changes.
• Document new public functions, methods and types.
• Make sure the documentation for updated functions, methods, and types is correct.
• Add tests for bugs that have been fixed.
• Put in reasonable effort to ensure that CI will pass.
  • make -C src/riscv
  • dune build src/lib_riscv
  • dune build src/rust_deps
• Benchmark performance and populate the table above if needed.
• Explain changes to regression test captures when applicable.
• Write commit messages to reflect the changes they're about.
• Self-review your changes to ensure they are high-quality.
• Complete all of the above before assigning this MR to reviewers.