forst-lang / forst / 24641043044

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feat(generate): opt-in streaming TS clients, chan T IR, and sidecar async iterable

Wire `compiler.generateStreamingClients` through `forst generate` into `GenerateTSOptions`,
extend `FunctionSignature` with stream metadata and merged `types.d.ts` declarations, and emit
`*Stream` methods that delegate to `invokeStreamingIterable<T>` with the same package/name/args
as `invokeFunction` when the return is `chan T` with a typable element type.

Add `TypeChannel` to the AST (parse `chan T`, Go `ChanType`, TS `AsyncIterable<elem>`),
`ChannelElementType` / `IsChannelReturn` in the typechecker, and export `StreamingSupported` in
discovery (including structural channel returns). Add `invokeStreamingIterable` on
`ForstSidecarClient` to bridge NDJSON callbacks to `for await`. Display `TypeImplicit` as `Any` in
type strings.

Example:

```json
{ "compiler": { "generateStreamingClients": true } }
```

```forst
func Events(): chan String {
  ...
}
```

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