v8_valueserializer

V8 14.9 (rusty_v8 149+) bumped the value-serializer wire format from 15 to 16. The only payload change is that ArrayBuffer / ArrayBufferView byte_length, byte_offset, and max_byte_length are written as size_t-width varints instead of uint32_t (see v8/src/objects/value-serializer.cc). For values whose magnitudes fit in u32 — the common case in practice — the on-wire bytes are identical, so accepting v16 in the deserializer lets us read values produced by V8 14.9 without further changes. Embedders that need to serialize ArrayBuffers larger than 4 GiB still need a wider follow-up. Bumps to 0.1.2 so denokv_sqlite (and downstream) can pick up the fix without a deno_kv API change. Needed for denoland/deno#34226.

Fix wasm init