Specifically, move numeric conversions from WasmGraphBuilder, and add
functionality for traps.
These will be used in wasm-gc lowering phases.

Change-Id: I73f0dab28d87db8f1c4c339ea3d871f262e270ab
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3654101Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80638}