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Replace a bunch of type-specific Wasm allocation functions with a generic byte allocator and reusable opaque out-parameters for pointers. This makes it a lot more ergonomic (relatively) to use the Wasm interface and removes a dozen or so exports. This also updates the `ghostty_type_json` `abi` field with a maximum alignment value that host sides can use to keep every allocation aligned properly, easily, without hardcoding numbers. This adds a test to verify this all works as intended and runs in CI.