Avoid overflow in component ABI size calculations - #14058
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Fixes #13980.
Preserve the canonical ABI size overflow sentinel when aligning and composing record and variant layouts and when advancing field offsets.
Add regression coverage for dynamic and const record/variant layouts and 32-/64-bit field offsets.
Tests:
cargo test -p wasmtime-environ --features component-modelcargo clippy -p wasmtime-environ --features component-model --all-targets -- -D warningscargo fmt -p wasmtime-environ -- --check