feat(runtime): add out-of-process JIT mode

[DaniPopes]

Adds an experimental out-of-process JIT compilation mode. Execution and ORC linking stay in the parent process so compiled EvmCompilerFn pointers remain local and transparent to callers, while translation/object emission can run in a helper process with per-job timeouts and helper respawn on failure.

The mode is disabled by default via RuntimeConfig::jit_mode = JitMode::InProcess. JitMode::OutOfProcess uses a persistent helper process, newline-delimited JSON IPC, and links returned object bytes into the parent ORC instance. This is still draft/prototype work; custom gas params and debug dumps are rejected for now.

[codspeed-hq]

Merging this PR will not alter performance

✅ 71 untouched benchmarks

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_{Comparing dani/out-of-process-jit (4e6efca) with main (bd333d0)}