Add wat2wasm example compatible with Embedded Swift#273
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Both `Stream` and `StreamError` are over-generalization of generic streams, while only `ByteStream` is actually used in `WasmParser`, and `StreamError` is always used with `UInt8` type parameter. Let's clean these up as unused, `WasmParser` is not in the business of providing general stream APIs. `StreamError` is now merged with `WasmParserError`, which simplifies future adoption of typed throws to unblock #273. While we're at it, `ByteStream` now conforms to `~Copyable`, but ideally we'd want it to return `Span<UInt8>` and not `ArraySlice` from its methods. Bumping required Swift version to 6.2 is required for that, which we're not ready to do just yet, so `~Escapable` constraint is not added in this PR.
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The main reason for using single array type is that combining error types from different visitor types is impractical in certain functions that combine those visitors, and probably also detrimental for code size and performance. Fortunately, existing error types fit well within the unified type, so mostly it's a text replacement to use `WasmKitError` everywhere. Unblocks #295 and #273.
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This is an example which demonstrates use of some (but not all) modules of WasmKit in Embedded Swift context.